8Barcroft, J. 2002. Semantic and structural elaboration in L2 lexical acquisition [J]. Language Learning 52, 2: 323-363.
9Bikle, K. L. 2005. Vocabulary Acquisition among English Learners in the Classroom Context [D]. Unpublished PhD dissertation, Stanford University, California, United States.
10Craik, F. I. M. & R. S. Lockhart. 1972. Levels of processing: A framework for memory research [J]. Journal of Verbal Learning and Verbal Behaviour 11 : 671-684.