Winford, Donald. 1990. Copula variability, accountability, and the concept of "polylectal" grammars. Journal of Pidgin and Creole Languages 5. 223-252.
@article{1600,
author = {Winford, Donald},
journal = {Journal of Pidgin and Creole Languages},
key = {Winford 1990b},
pages = {223-252},
title = {Copula variability, accountability, and the concept of "polylectal" grammars},
volume = {5},
year = {1990}
}