Tolong jelaskan mengenai Variasi sosial dari Bahasa Inggris Amerika

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Labov, William. (1972). Language in the inner city: Studies in Black English Vernacular. Philadelphia: University of Pennsylvania Press.

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Mufwene, Salikoko; Rickford, John R.; Bailey, Guy; & Baugh, John (Eds.). (1998). African American Vernacular English. London: Routledge.

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Wolfram, Walt. (1969). A sociolinguistic description of Detroit negro speech. Urban linguistic series (No. 5). Washington, D.C.: Center for Applied Linguistics.

Wolfram, Walt; & Thomas, Erik. (2002). The development of African American English: Evidence from an isolated community. Malden, MA: Blackwell.