Bilal, Clement. 2004. The Adamawa-Ubangi Languages in Sudan. Occasional Papers in the Study of Sudanese Languages 9. 175–183.
@article{1436_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} }