The Origin of the Verbal -S in Black English. Schneider, E. W. American Speech, 58(2):99, 1983.
The Origin of the Verbal -S in Black English [link]Paper  doi  bibtex   
@article{schneider_origin_1983,
	title = {The {Origin} of the {Verbal} -{S} in {Black} {English}},
	volume = {58},
	issn = {00031283},
	url = {https://www.jstor.org/stable/455322?origin=crossref},
	doi = {10.2307/455322},
	number = {2},
	urldate = {2020-04-13},
	journal = {American Speech},
	author = {Schneider, Edgar W.},
	year = {1983},
	pages = {99},
}

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