Alghamdi, H. H. (2018). Exploring second language vocabulary learning in ESL classes. English Language Teaching, 12(1), 78.doi:10.5539/elt.v12n1p78 

Amini, M., Zahabi, A., Amini, D., & Hosseini, S. S. A. (2020). A Review of Reading Strategies and Models in Learning and Teaching of English as a Foreign Language. AJELP: Asian Journal of English Language and Pedagogy, 8(2), 14-26.https://doi.org/10.37134/ajelp.vol8.2.2.2020 

Awalludin, M. F. N., Rosli, M. S., Saleh, N. S., Atan, N. A., & Subramanian, T. S. (2019). Video games as vocabulary enhancement instrument in the 21st century classroom. International Journal of Recent Technology and Engineering, 8(2Special Issue),285–290. 

Bai, Z. (2018). An analysis of English vocabulary learning strategies. Journal of Language Teaching and Research, 9(4), 849–855. https://doi.org/10.17507/jltr.0904.24 

Basuki, Y., & Hidayati, Y. (2019). Kahoot! or Quizizz: the Students’ Perspectives. Proceedings of the Proceedings of the 3rd English Language and Literature International Conference, ELLiC, 27th April 2019, Semarang, Indonesia 

Baxter, P., &Jack, S. (2008). Qualitative Case StudyMethodology: StudyDesign and Implementation for Novice Researchers. The Qualitative Report, 13(4), 544­559.https://doi.org/10.46743/2160-3715/2008.1573 

Bereczki, E.O., & Kárpáti, A. (2021). Technology-enhanced creativity: A multiple case study of digital technology-integration expert teachers’ beliefs and practices. Thinking Skills and Creativity, 39,100791. 

Busetto, L., Wick, W. & Gumbinger, C. How to use and assess qualitative research methods. Neurol. Res. Pract. 2, 14 (2020).https://doi.org/10.1186/s42466-020­00059-z 

Candel, E. C., Agustín, M. P., & de Ory, E. G. (2021). ICT and gamification experiences with CLIL methodology as innovative resources for the development of competencies in compulsory secondary education. Digital Education Review, 39.https://doi.org/10.1344/DER.2021.39.238-256 

Chaiyo, Y., & Nokham, R. (2017). The effect of Kahoot, Quizizz and Google Forms on the student’s perception in the classrooms response system. 2nd Joint International Conference on Digital Arts, Media and Technology 2017: Digital Economy for Sustainable Growth, ICDAMT 2017,178–182. 

Chapman, J. R., & Rich, P. J. (2018). Does educational gamification improve students’ motivation? If so, which game elements work best? Journal of Education for Business, 93(7), 314–321. https://doi.org/10.1080/08832323.2018.1490687 

Cohen, L., Manion, L., & Morrison, K. (2018). Research Methods in Education (8th ed.).London:Routledge.https://doi.org/10.4324/9781315456539 

Cook, David & Artino, Anthony. (2016). Motivation to learn: an overview of contemporary theories. Medical Education. 50.997-1014. 10.1111/medu.13074. 

Creswell, J. W. (2008). Educational research: Planning, conducting, and evaluating quantitative and qualitative research (3rd ed.). Pearson Education,Inc. 

Creswell, J. W. (2012). Educational research: Planning, conducting, and evaluating quantitative and qualitative research. Pearson. 

Creswell, J. W. (2014). Research design : qualitative, quantitative, and mixed methods approaches (4thed.). Sage Publications. 

Creswell, J. W., & Creswell, J. D. (2018). Research design: Qualitative, quantitative, and Mixed Methods Approaches (5thed.). SAGE Publications. 

Damico, J. S., & Ball, M. J. (2019). Theories of Language Acquisition. In The SAGE Encyclopedia of Human Communication Sciences and Disorders. SAGE Publications,Inc. https://doi.org/10.4135/9781483380810.n632 

Darmawan, M. S., Daeni, F., & Listiaji, P. (2020). The Use of Quizizz As an Online AssessmentApplicationfor. Unnes Science Education Journal, 9(3),144–150. https://doi.org/10.15294/USEJ.V9I3.41541 

Deci, E. L., & Ryan, R. M. (1985). The general causality orientations scale: Self-determination in personality. Journal of Research in Personality, 19(2), 109– 134.https://doi.org/10.1016/0092-6566(85)90023-6 

Deci, E. L., & Ryan, R. M. (2008). Self-determination theory: A macrotheory of human motivation, development, and health. Canadian Psychology, 49(3), 182–185.https://doi.org/10.1037/a0012801 

Degirmenci, R. (2021). The Use of Quizizz in Language Learning and Teaching from the Teachers ’ and Students ’ Perspectives : A Literature Review. In Language Education and Technology (LET Journal) (Vol. 1, Issue 1). http://langedutech.com 

Dehghanzadeh, H., Fardanesh, H., Hatami, J., Talaee, E., & Noroozi, O. (2021). Using gamification to support learning English as a second language: a systematicreview. In Computer Assisted Language Learning (Vol. 34,Issue 7, pp.934–957). Routledge. https://doi.org/10.1080/09588221.2019.1648298 

Deterding, S., Dixon, D., Khaled, R., & Nacke, L. (2011). From game design elements to gamefulness: Defining “gamification.” Proceedings of the 15th International Academic MindTrek Conference: Envisioning Future Media Environments, MindTrek 2011, 9–15. https://doi.org/10.1145/2181037.2181040 

Dewey, J. (1916). Democracy and education: An introduction to the philosophy of education. New York:MacMillan. 

Ebrahimi, S. S., & Yeo, K. J. (2018). The Use of Technology at Malaysian Public High Schools. Merit Research Journal of Education and Review (Vol. 6, pp. 54–060). Retrieved fromhttp://meritresearchjournals.org/asss/index.htm 

Fakhruddin, A., & Nurhidayat, E. (2020). Students’ Perception On Quizziz As Game Based Learning In Learning Grammar In Writen Discourse. Wiralodra English Journal, 4(2), 28–38.https://Doi.Org/10.31943/Wej.V4i2.101 

Feng, W., & Lu, Q. (2020). An Action Study on Morning Reading Activity on Campus Among College English Learners. Studies in Literature and Language, 21(2),76–83.https://doi.org/10.3968/11906 

Fernandez-Rio, J., de las Heras, E., González, T., Trillo, V., & Palomares, J. (2020). Gamification and physical education. Viability and preliminary views from students and teachers. Physical Education and Sport Pedagogy, 25(5), 509– 524.https://doi.org/10.1080/17408989.2020.1743253 

Garris, R., Ahlers, R., & Driskell, J. E. (2002). Games, motivation, and learning: A research and practice model. Simulation and Gaming, 33(4), 441–467. https://doi.org/10.1177/1046878102238607 

Guest, G., Namey, E., &McKenna, K. (2017). How Many Focus Groups Are Enough? Building an Evidence Base for Nonprobability Sample Sizes. In Field Methods (Vol. 29, Issue 1, pp. 3–22). https://doi.org/10.1177/1525822X16639015 

Halim, M. S. A. A., Hashim, H., & Yunus, M. M. (2020). Pupils’ Motivation and Perceptions on ESL Lessons through Online Quiz-Games. Journal of Education and E-Learning Research, 7(3),229–234. 

Hamari, J., Koivisto, J., & Sarsa, H. (2014). Does gamification work? -A literature review of empirical studies on gamification. Proceedings of the Annual Hawaii International Conference on System Sciences, 3025–3034. https://doi.org/10.1109/HICSS.2014.377 

Hashim, H. (2018). Application of technology in the digital era education. International Journal of Research in Counseling and Education, 1(2), 1 –5. https://doi.org/10.24036/002za0002 

Hasram,S.,Arif, F. K. M.,Nasir, M. K. M.,Mohamad,M.,Daud, M. Y.,Rahman,M. 

J. A., & Mohammad, W. M. R. W. (2020). Online Games for Primary School Vocabulary Teaching and Learning: A Literature Review. Creative Education, 11(11),2327–2336.https://doi.org/10.4236/ce.2020.111117 

Harji, M. B., Balakrishnan, K., Bhar, S. K., & Letchumanan, K. (2015). Vocabulary Levels and Size of Malaysian Undergraduates. English Language Teaching, 8(9),119–130.https://doi.org/10.5539/elt.v8n9p119 

Hiew, W. (2012). English Language Teaching and Learning Issues in Malaysia: Learners’ Perceptionsvia Facebook Dialogue Journal. Journal ofArts, Science &Commerce, 3,11-19. 

Huei, L. S., Yunus, M. M., & Hashim, H. (2021). Strategy to improve english vocabulary achievement during COVID-19 epidemic. Does quizizz help? Journal of Education and E-Learning Research, 8(2), 135–142. https://doi.org/10.20448/JOURNAL.509.2021.82.135.142 

Idris, Mohd & Mohd Said, Nur Ehsan & Tan, Kim Hua. (2020). Game-Based LearningPlatformand itsEffects onPresent Tense Mastery: Evidence from an ESL Classroom. International Journal of Learning, Teaching and Educational Research.19.13-26. 10.26803/ijlter.19.5.2. 

Irwansyah, R., & Izzati, M. (2021). Implementing Quizizz as Game Based Learning and Assessment in the English Classroom. TEFLA Journal (Teaching English As Foreign Language And Applied Linguistic Journal), 3(1), 13-18. Retrieved fromhttps://journal.umbjm.ac.id/index.php/TEFLA/article/view/756 

Kashinathan, S., & Abdul Aziz, A. (2021). ESL Learners’ Challenges in Speaking English in Malaysian Classroom. International Journal of Academic Research in Progressive Education and Development, 10(2), 983–991. https://doi.org/10.6007/ijarped/v10-i2/1035 

Kiew, S., & Shah, P. M. (2020). Factors Affecting Reading Comprehension among Malaysian ESL Elementary Learners. Creative Education, 11(12), 2639–2659. https://doi.org/10.4236/ce.2020.1112196 

Kitzinger, J. (1995). Qualitative Research: Introducing focus groups. Bmj, 311(7000), 299.https://doi.org/10.1136/bmj.311.7000.299 

Korstjens, I., & Moser, A. (2017). Series: Practical guidance to qualitative research. part4: Trustworthiness and publishing. European Journal of General Practice, 24(1),120–124.https://doi.org/10.1080/13814788.2017.1375092 

Krashen,S. D. (1982). Principlesandpractice insecond language acquisition.Oxford: PergamonPress. 

Landers, R. N., & Callan, R. C. (2011). Casual social games as serious games: The psychologyof gamification inundergraduate education and employee training. In Serious games and edutainment applications (pp. 399-423). Springer, London. 

Landers, R. N. (2014). Developing a Theory of Gamified Learning: Linking Serious Games and Gamification of Learning. Simulation and Gaming, 45(6), 752– 768.https://doi.org/10.1177/1046878114563660 

Lim, T. M., & Yunus, M. M. (2021). Teachers’ perception towards the use of Quizizz in the teaching and learning of English: A systematic review. Sustainability (Switzerland), 13(11). https://doi.org/10.3390/su13116436 

Merriam, S. B. (1988). Case study research in education: A qualitative approach. Jossey-Bass. 

Merriam, S. B., & Tisdell, E. J. (2016). Qualitative Research: A Guide to Design and Implementation(4thed.). SanFrancisco,CA:JosseyBass. 

Misbah, N. H., Mohamad, M., Yunus, M. M., & Ya’acob, A. (2017). Identifying the Factors Contributing to Students’ Difficulties in the English Language Learning. Creative Education, 08(13), 1999–2008. https://doi.org/10.4236/ce.2017.813136 

Mohamad, M., Mohd, K., Bity Salwana Alias, & Melor Md Yunus. (2020). Online Game-Based Formative Assessment: DistantLearners PostGraduate Students’ Challenges Towards Quizizz. International Journal of Scientific & Technology Research, 9(4), 994–1000. 

Mohd Jalani, N. A. B., Hashim, H. B., Jalani, N. A. B. M., & Hashim, H. B. (2020). Quizziz: ESL Students’ Perceptions in rural school. International Journal of Scientific and Research Publications (IJSRP), 10(3), p9904. https://doi.org/10.29322/ijsrp.10.03.2020.p9904 

Mohd Tahir, M. H., Mohd Adnan, A. H., Ya Shak, M. S., Mohamad Shah, D. S., & Devi Piaralal, S. (2022). Secondary ESL Teachers Use of Google Classroom during COVID-19 Pandemic. Malaysian Journal of Social Sciences and Humanities (MJSSH), 7(5), e001502. https://doi.org/10.47405/mjssh.v7i5.1502 

Nagashibaevna, Y. K. (2019). Students’ lack of interest: how to motivate them? Universal Journal of Educational Research, 7(3), 797– 802.https://doi.org/10.13189/ujer.2019.070320 

Nair, S., & Mathew, J. (2019). A theoretical framework for gamified learning. International Journal of Innovative Technology and Exploring Engineering, 8(12),2846–2851.https://doi.org/10.35940/ijitee.L3032.1081219 

Nation, I. S. P. (1994). New ways in teaching vocabulary. Alexandria, VA: Teachers ofEnglishtoSpeakersof OtherLanguages. 

Nation, P. and Waring, R. (1997) Vocabulary Size, Text Coverage and Word Lists. In: Schmitt, N. and McCarthy, M., Eds., Vocabulary: Description, Acquisition, andPedagogy, Cambridge UniversityPress,Cambridge,6-19. 

Nezhad, A. N., Moghali, M., & Soori, A. (2015). Explicit and Implicit Learning in Vocabulary Acquisition. Asian Journal of Education and E-Learning, 03(01), 2321–2454.www.ajouronline.com 

Ni, L. B., Chai, W. L., & Abdullah, S. (2021). Smart Learning Improves Student Participation. Malaysian Journal of Social Sciences and Humanities (MJSSH), 6(4),227–241.https://doi.org/10.47405/mjssh.v6i4.738 

Pahamzah, J., Syafrizal, & Juniardi, Y. (2020). Quizizz As a Students’ Reading Comprehension Learning Media: A Case Study at The Eleventh Grade of Dwi PutraBangsa Vocational SchoolinCimanggu. International JournalofEnglish Language andLinguistics Research,8(5), 27–33. 

Patton, M. Q. (2015). Qualitative Evaluation and Research Methods. Thousand Oaks, CA:Sage. 

Pavita, m. D. A., & nirmala, d.N. (2021). Merdeka belajar in pandemic: usingquizizz game based learning to improve students’ vocabulary mastery. Language literacy: journal of linguistics, literature, and language teaching, 5(1), 221– 227.https://doi.org/10.30743/ll.v5i1.3842 

Pazilah, F. N. P., Hashim, H., & Yunus, M. M. (2019). Using Technology in ESL Classroom: Highlights and Challenges. Creative Education, 10(12), 3205– 3212.https://doi.org/10.4236/ce.2019.1012244 

Peels, R., & Bouter, L. (2021). Replication and trustworthiness. Accountability in Research, 00(00),1–11.https://doi.org/10.1080/08989621.2021.1963708 

Peregoy, S., & Boyle, O. (2008). Reading, writing, and learning in ESL. (5th ed.) Boston:Pearson. 

Pradnyadewi, D. A. M., & Kristiani, P. E. . (2021). The Use of Quizizz In Improving Students’ Reading Skill. The Art of Teaching English As a Foreign Language,2(1), 1-6.https://doi.org/10.36663/tatefl.v2i1.93 

Priyanti, N., Santosa, M., & Dewi, K. (2019). Effect of quizizz towards the eleventh-grade english students’ reading comprehension in mobile learning context. Language and Education Journal Undiksha, 2(2), 71–80. https://doi.org/10.23887/leju.v2i2.20323 

Qing, Q.Y. & Abdul Halim, H (2021). Teacher’s Application Of Gamification In Teaching English Online In Malaysian Secondary Schools. International JournalofEducation andPedagogy, 3(4),120–130. 

Rajendran, T., Bin Naaim, N. A., & Yunus, M. M. (2019). Pupils Motivation And Perceptions Towards Learning English Using Quizvaganza. International Journal of Scientific and Research Publications (IJSRP), 9(1), p8529. https://doi.org/10.29322/IJSRP.9.01.2019.p8529 

Rafiq,K. R. M.,Pazilah, F. N., Yunus,M. M.,Hashim, H., &Sabri, M. H. M. (2019). Gamified-Learning Brings Out the Hero in You! International Invention, Innovative & Creative (InIIC) Conference Series 2/2019,67–71. 

Roshdan, N. F. M., Roslim, N., & Yahyauddin, N. (2021, December). Students' PerceptionstowardstheUse ofQuizzizas AToolinImproving ReadingSkills. In Proceedings of International Conference on English Language Teaching (INACELT) (Vol. 5,No. 1,pp.101-108). 

Ryan, R. M., & Deci, E. L. (2017). Self-determination theory: Basic psychological needs in motivation, development, and wellness. Guilford Publications.Junior, 

J. B. B. (2020). Assessment for Learning With Mobile Apps: Exploring the Potential of Quizizz in the Educational Context. International Journal of Development Research, 10(1),33366–33371. 

Shenton, A. K. (2004). Strategies for Ensuring Trustworthiness in QualitativeResearch Projects. Education for Information, 22, 63-75. https://doi.org/10.3233/EFI-2004-22201 

Stahl, Norman & King, James. (2020). Expanding Approaches for Research: Understanding andUsingTrustworthinessinQualitativeResearch. 44.26-28 

Sufian, S. A., Nordin, N. A., Tauji, S. S. N. & Nasir, M. K. M. (2020). The Impact of Covid-19 on the Malaysian Education System. International Journal of AcademicResearch inProgressive Education&Development. 9(2), 764-774 

Surianshah, S. (2021). Digital Divide in Education during COVID-19 Pandemic. Jurnal EkonomiMalaysia,55(3),103–112.https://doi.org/10.17576/JEM-2021­5503-07 

Turner, D. P. (2020). Sampling Methods in Research Design. In Headache (Vol. 60, Issue1,pp.8–12). https://doi.org/10.1111/head.13707 

VanTassel-Baska, Joyce. (2012). Analyzing Differentiation in the Classroom: Using theCOS-R. Gifted-child-today. 35.42-48.10.1177/1076217511427431. 

Virginia Braun & Victoria Clarke (2006) Using thematic analysis in psychology, Qualitative Research in Psychology, 3:2, 77­101,DOI: 10.1191/1478088706qp063oa 

Webster, N.L., & Lu, C. (2012). “English Language Learners”: An Analysis of PerplexingESL-Related Terminology. Language and Literacy, 14,83-94. 

Weng, Xiaojing & Jong, Morris & Chiu, Thomas K.F.. (2020). Implementation ChallengesofSTEMEducation:from Teachers'Perspective. 

Whai, M. K. G., & Ling, Y.-L. (2020). The Relevance Use of Technology in Teaching English in Malaysian Schools : Are We Ready Mentally for the Shift ? Journal of Social Sciences and Technical Education, 1(1), 105–113. 

Whitton, N., & Moseley, A. (2014). Deconstructing Engagement: Rethinking Involvement in Learning. Simulation and Gaming, 45, 433–449. https://doi.org/10.1177/1046878114554755 

Willig, J. H., Croker, J., McCormick, L., Nabavi, M., Walker, J.,Wingo, N. P., Roche, 

C. C., Jones, C., Hartmann, K. E., & Redden, D. (2021). Gamification and education: A pragmatic approach with two examples of implementation. Journal of Clinical and Translational Science, 5(1). https://doi.org/10.1017/cts.2021.806 

Wong, A. S. C., Lee, J. Y. V., Fung, M., & Willibrord, O. (2019). Vocabulary Size of Malaysian Secondary School Students. International Journal of Modern Languages and Applied Linguistics, 3(4), 27. https://doi.org/10.24191/ijmal.v3i2.7364 

Wulandari, E (2019). Implying Quizizz in Improving Students’ vocabulary at The Eight Grade Students of SMP Negeri 2 Susoh. Thesis, Muhammadiyah Aceh BaratDaya 

Yanes, N., & Bououd, I. (2019). Using Gamification and Serious Games for English Language Learning. 2019 International Conference on Computer and Information Sciences (ICCIS).https://doi.org/10.1109/iccisci.2019.8716451 

Yin, R. K. (2009). Case study research: Design and methods. Thousand Oaks, Calif: Sage Publications. 

Yunus, M. M. (2018). innovation in education and language learning in 21st century. Journal of Sustainable Development Education and Research, 2(1), 33. https://doi.org/10.17509/jsder.v2i1.12355 

Yunus, C. C. A., & Hua, T. (2021). Exploring a gamified learning tool in the ESL classroom: the case of Quizizz. Journal of Education and E-learning Research, 

8(1),103–108.https://doi.org/10.20448/journal.509.2021.81.103.108 

Zhao, F. (2019). Using quizizz to integrate fun multiplayer activity in the accounting classroom. International Journal of Higher Education, 8(1), 37–43. https://doi.org/10.5430/ijhe.v8n1p37 

Zuhriyah, S., & Pratolo, B. W. (2020). Exploring students’ views in the useof quizizz as an assessment tool in english as a foreign language (efl) class. Universal Journal of Educational Research, 8(11), 5312–5317. https://doi.org/10.13189/ujer.2020.081132