Hersen, M. (1976). Single-case experimental designs. In International Handbook of Behavior Modification and Therapy: Second Edition (pp. 175-210). Boston, MA: Springer US.Ching, S. Ching, S. M., Yee, A., Ramachandran, V., Sazlly Lim, S. M., Wan Sulaiman, W. A., Foo, Y. L., & Hoo, F. K. (2015). Validation of a Malay version of the smartphone addiction scale among medical students in Malaysia. PloS one, 10(10), e0139337.Choliz, M. (2010). Mobile phone addiction: a point of issue. Addiction, 105(2), 373-374. Craig, A. R. (2010). Self-administered behavior modification to reduce nail biting: Incorporating simple technology to ensure treatment integrity. Behavior Analysis in Practice, 3, 38-41. Gui, M., & Gerosa, T. (2021). Smartphone pervasiveness in youth daily life as a new form of digital inequality. In Handbook of digital inequality (pp. 131-147). Edward Elgar Publishing. Ithnain, N., Ghazali, S. E., & Jaafar, N. (2018). Relationship between smartphone addiction with anxiety and depression among undergraduate students in Malaysia. Int J Health Sci Res, 8(1), 163-171.Klonoff, D. C. (2007). Benefits and limitations of self-monitoring of blood glucose. LeBlanc, L. A., Hagopian, L. P., & Maglieri, K. A. (2000). Use of a token economy to eliminate Excessive inappropriate social behavior in an adult with developmental disabilities. Behavioral Interventions, 15(2), 135-143.