Sources
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Cazden, Courtney B. and Catherine Snow. English Plus: Issues in Bilingual Education. The Annals of the American Academy of Political and Social Science 508, 1999.
Weinstein, Brian. The Civic Tongue: political Consequences of language Choices. New York: Longman, 1983.
Larmouth, Donald W. “Does Linguistic Heterogeneity Erode National Unity?” Ethnicity and language.Wiston Van Horne, ed. Milwaukee, WI : University of Wisconsin System, Institute on Race and Ethnicity, 1987. 37-57.