Bilal, Clement. 2004. The Adamawa-Ubangi Languages in Sudan. Occasional Papers in the Study of Sudanese Languages 9. 175–183.
@article{1435_viri,
author = {Bilal, Clement},
journal = {Occasional Papers in the Study of Sudanese Languages},
pages = {175–183},
title = {The Adamawa-Ubangi Languages in Sudan},
volume = {9},
year = {2004}
}