6Meara, P. Vocabulary acquisition: a neglected aspect of language learning [J]. Language Teaching and Linguistics Abstraet. 1980,13:221-246.
7Cohen, A. D. & Aphek, E. Retention of second language vocabulary over time: investigating the role of mnemonic association[J]. System, 1980 ,(8) 3 : 221-235.
8Craik, F. I. M. & Lockhart, R. S. Levels of processing: a framework for memory research[J]. Journal of Verbal Learning and Verbal Behavior, 1975 ,(11) : 671-684.
9Lawson, M.J. & Hogben, D. The vocabulary learning strategies of foreign language students[J]. Language Learning, 1996, ( 4 ): 101 - 135.