A sociolinguistic description of Detroit Negro speech. Wolfram, W. Center for Applied Linguistics, Washington, D.C., 1969.
bibtex   
@book{wolfram_sociolinguistic_1969,
	address = {Washington, D.C.},
	title = {A sociolinguistic description of {Detroit} {Negro} speech},
	publisher = {Center for Applied Linguistics},
	author = {Wolfram, Walt},
	year = {1969},
	keywords = {Invariant be},
}

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