1Bahrick H.Fifty years of second language attrition: Implicationsfor programmatic research [J].The Modern Language Journal,1984,68(2):105-118.
2Cummings,J.Linguistics interdependence and the educationaldevelopment of bilingual children [J].Review of EducationalResearch,1979(49):222-251.
3Edwards,G. (ed.) Second-language Retention in the PublicService of Canada [C].Ottawa: Public Service Commission ofCanada, 1977.
4Kennedy,L.The retention of certain Latin syntactical principlesby first and second year Latin students after various timeintervals [J]. Journal of Educational Psychology 1932,(23):132- 146.
5KopkeB, Schmid M . Languageattrition: theoretical perspectives[M]. Philadelphia: John Benjamins Publishing Company,2007:9-31.
6Hansen, L.Language attrition : The fate of the start[J]. AnnualReview of Applied Linguistics,2001 (21):60- 73.
7Neisser U. Interpreting Harry Bahrick’ s discovery: Whatconfers immunity against forgetting- [J]. Journal of ExperimentalPsychology: General, 1984,113(1 ):32-35.
7Allendorff, S. 1980. Wiedererwerb einer Zweitsprache, dargestellt am Bcispiel der Englischen Negation [ D]. PhD Dissertation. Englisches Seminar der Universitat Kiel.
8Bahrick, H. 1984. Fifty years of second language attrition: Implications for programmatic research [J].The Modern Language Journal 68: 105-118.
9Clark, J. &E. Jorden. 1984. A Study of Language Attrition in Former U. S. Students of Japanese and Implications for Design of Curriculum and Teaching Materials. Final Project Report [M]. Washington, DC: Center for Applied Linguistics.
10Cohen, A. 1975. Forgetting a second language [J]. Language Learning 25: 127-138.