2Avila, E. & Sadoski, M. 1996. Exploring new applications of the keyword method to acquire English vocabulary. Language Learning 46:379 - 395.
3Cohen, A. D. & Aphek, E. 1980. Retention of second language vocabulary over time: Investigating the role of mnemoic association. System 8:221 - 235.
4Jiang, N. 2000. Lexical representation and development in a second language. Applied Linguistics 21 : 47 -77.
5Hazenberg, S. & Hulstijn, J. H. 1996. Defining a minimal receptive second language vocabulary for non-native university students: An empirical investigation. Applied Linguistics 17:145 - 163.
6Henriksen. B. 1999. Three dimensions of vocabulary development. Studies in Second Language Acquisition 21 : 303 - 317.
7Huckin, T., M. Haynes & J. Coady. 1993. Second Language Reading and VocabulaO' Learning. Norwood, N J: Ablex.
8Kerlinger, F. N. & H. B. Lee. 2000. Foundations of Behavioral Research (4^th ed.). Orlando: Harcourt, Inc.
9Labov, W. 1973. The boundaries of words and their meanings. In New Ways of Analyzing Variation in English ed. C. J. N. Bailey & R. W. Shuy, 430- 373. Washington DC: Georgetown University Press.
10Laufer, B. 1992. Reading in a foreign language: How does L2 lexical knowledge interact with the reader's general academic ability? Journal of Research in Reading 15: 95- 103