1. Akbarian, I. (2010). The relationship between vocabulary size and depth for ESP/EAP learners. System, 38(3), 391- 401. 2. Baba, K. (2009). Aspects of lexical proficiency in writing summaries in a foreign language. Journal of Second Language Writing, 18(3), 191-208. 3. Batty, A.O. (2007). Vocabulary depth in written and oral assessment. In K. Brandford-Watts (Ed.), JALT 2006 Conference Proceedings (pp. 1100-1108). Tokyo: JALT. 4. Beglar, D., & Hunt, A. (1999). Revising and validating the 2000 word level and university word level vocabulary tests. Language Testing, 16(2), 131-162. 5. Bogaards, P., & Laufer, B. (2004). Vocabulary in a Second Language. Amsterdam/Philadelphia: John Benjamins Publishing Company. 6. Coady, J., Magoto, J., Hubbard, P., Graney, J., & Mokhtari, K. (1993). High frequency vocabulary and reading proficiency in ESL readers. In Huckin, T., Hynes, M., & Coady, J. (Eds.), Second Language Reading and Vocabulary Acquisition (pp. 217-226). Ablex, Norwood, NJ. 7. Engber, C.A. (1995). The relationship of lexical proficiency to the quality of ESL compositions. Journal of Second Language Writing, 4(2), 139-155. 8. Geranpayeh, A. (2003). A quick review of the English Quick Placement Test. UCLES Research Notes, 12, 8-10. 9. Henriksen, B. (1999). Three Dimensions of Vocabulary Development. Studies in Second Language Acquisition, 21(2), 303-317. 10. Ishii, T., & Schmitt, N. (2009). Developing an integrated diagnostic test of vocabulary size and depth. RELC Journal, 40(1), 5-22. 11. Kaivanpanah, S., & Zandi, H. (2009). The role of depth of vocabulary knowledge in reading comprehension in EFL context. Journal of Applied Sciences, 9(4), 698-706. 12. Laufer, B., & Goldstein, Z. (2004). Testing vocabulary knowledge: size, strength, and computer adaptiveness. Language Learning, 54(3), 399-436. 13. Laufer, B., & Nation, P. (1995). Vocabulary size and use: lexical richness in L2 writing production. Applied Linguistics, 16(3), 307-322. 14. Laufer, B., & Nation, P. (1999). A vocabulary-size test of controlled productive ability. Language Testing, 16(1), 33-51. 15. Laufer, B., Elder, C., Hill, K., & Congdon, P. (2004). Size and strength: do we need both to measure vocabulary knowledge? Language Testing, 21(2), 202-226. 16. Lee, S.H. (2003). ESL learners’ vocabulary use in writing and the effects of explicit vocabulary instruction. System 31(4), 537-561. 17. Mehrpour, S., & Rahimi, M. (2010). The impact of general and specific vocabulary knowledge on reading and listening comprehension: A case of Iranian EFL learners. System, 38(2), 292-300. 18. Nassaji, H. (2004). The Relationship between Depth of Vocabulary Knowledge and L2 Learners’ Lexical Inferencing Strategy Use and Success. The Canadian Modern Language Review, 61(1), 107-134. 19. Nassaji, H. (2006). The Relationship between Depth of Vocabulary Knowledge and L2 Learners’ Lexical Inferencing Strategy Use and Success. The Modern Language Journal, 90 (3), 387-401. 20. Nation, P. (1983). Testing and teaching vocabulary. Guidelines, 5(1), 12-25. 21. Nation, P. (1993). Using dictionaries to estimate vocabulary size: essential, but rarely followed, procedures. Language Testing, 10(1), 27-40. 22. Qian, D.D. (1998). Depth of vocabulary knowledge: assessing its role in adult’s reading comprehension in English as a second language. Unpublished PhD Dissertation. 23. Qian, D.D. (1999). Assessing the roles of depth and breadth of vocabulary knowledge in reading comprehension. The Canadian Modern Language Review, 56(2), 282-307. 24. Qian, D.D. (2002). Investigating the relationship between vocabulary knowledge and academic reading performance: an assessment perspective. Language Learning, 52(3), 513-536. 25. Read, J. & Chapelle, C.A. (2001). A framework for second language vocabulary assessment. Language Testing, 18(1), 1-32. 26. Read, J. (1993). The development of a new measure of L2 vocabulary knowledge. Language Testing, 10(3), 355-371. 27. Read, J. (2000). Assessing Vocabulary. Cambridge: Cambridge University Press. 28. Read, J. (2004). Plumbing the depths: How should the construct of vocabulary knowledge be defined? In Bogaards,P., & Laufer, B. (Eds.), Vocabulary in a Second Language (pp. 209-227). Amsterdam/Philadelphia: John Benjamin Publishing Company. 29. Read, J. (2007). Second language vocabulary assessment: Current practices and new directions. International Journal of English Studies, 7(2), 105-125. 30. Schmitt, N. (2008). Review article: Instructed second language vocabulary learning. Language Teaching Research, 12(3), 329-363. 31. Schmitt, N., Ching Ng, J.W., & Garras, J. (2011). The Word Associates Format: Validation evidence. Language Testing, 28(1), 105-126. 32. Schmitt, N., Schmitt, D., & Clapham, C. (2001). Developing and exploring the behaviour of two new versions of the Vocabulary Levels Test. Language Testing, 18(1), 55-88. 33. Schoonen, R. & Verhallen, M. (1998). Aspects of vocabulary knowledge and reading performance. Paper presented at the Annual Meeting of the American Educational Research Association, San Diego. 34. Schoonen, R. & Verhallen, M. (2008). The assessment of deep word knowledge in young first and second language learners. Language Testing, 25 (2), 211-236. 35. Shen, Z. (2008). The Roles of Depth and Breadth of Vocabulary Knowledge in EFL Reading Performance. Asian Social Science, 4 (12), 135-137. 36. Shiotsu, T., & Weir, C.J. (2007). The relative significance of syntactic knowledge and vocabulary breadth in the prediction of reading comprehension test performance. Language Testing, 24(1), 99-128. 37. University of Cambridge: ESOL Examinations (2004). Quick Placement Test (Version 1). Oxford University Press. 38. Wolter, B. (2002). Assessing proficiency through word associations: is there still hope? System, 30(3), 315-329. 39. Xing, P., & Fulcher, G. (2007). Reliability assessment for two versions of Vocabulary Levels Tests. System, 35(2), 182-191. 40. Zhang, L.J., & Anual, S.B. (2008). The Role of Vocabulary in Reading Comprehension: The Case of Secondary School Students Learning English in Singapore. RELC Journal, 39(1), 51-76.