Poplack, Shana and Tagliamonte, Sali. 1989. There's no tense like the present: Verbal -s inflection in Early Black English. Language Variation and Change 1. 47-84.
@article{1228,
author = {Poplack, Shana and Tagliamonte, Sali},
journal = {Language Variation and Change},
key = {Poplack & Tagliamonte 1989},
pages = {47-84},
title = {There's no tense like the present: Verbal -s inflection in Early Black English},
volume = {1},
year = {1989}
}