4Ammon U. The International Standing of the German Language [ M ]. Cambridge: Cambridge University Press, 2003.
5Bousquet G. A model for interdisciplinary collaboration [ J ]. The Modern Language Journal, 2008, (92) : 304-306.
6Donato R & Tucker G. K-12 language learning and foreign language educational policy: A school-based per- spective [J]. The Modern Language Journal, 2007, (91) : 256-258.
7Genesee F, Lindholm-Leary K, Saunders W & Christian D (eds.). Educating English Language Learners: A Synthesis of Research Evidence [ M]. New York: Cambridge University Press, 2006.
8Hayworth J D & Eule J J. Whatever It Takes: Illegal Immigration, Border Security, and the War on Terror [ M]. Washington, D. C. : Regnery, 2006.
9Modern Language Association. Enrollments in Languages Other Than English in United States Institutions of Higher Education, Fall 2006 [ EB/OL]. http ://www. mla. org/2006_flenrollmentsurvey, 2008.
10Paulston C B. Linguistic Minorities in Multilingual Settings : Implications for Language Policies [ M ]. Amster- dam/Philadelphia: John Benjamins Publishing, Co., 1994.
