Ethnolinguistic marking of past be in Lumbee Vernacular English. Wolfram, W. & Sellers, J. Journal of English Linguistics, 27(2):94–114, June, 1999.
Ethnolinguistic marking of past be in Lumbee Vernacular English [link]Paper  doi  bibtex   
@article{wolfram_ethnolinguistic_1999,
	title = {Ethnolinguistic marking of past be in {Lumbee} {Vernacular} {English}},
	volume = {27},
	issn = {0075-4242, 1552-5457},
	url = {http://eng.sagepub.com/content/27/2/94},
	doi = {10.1177/007542429902700203},
	language = {en},
	number = {2},
	urldate = {2016-06-07},
	journal = {Journal of English Linguistics},
	author = {Wolfram, Walt and Sellers, Jason},
	month = jun,
	year = {1999},
	keywords = {Copula},
	pages = {94--114}
}

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