K. Lojenga and C. , Ngiti: A Central-Sudanic Language of Zaire, Language, vol.76, issue.1, 1994.
DOI : 10.2307/417412

L. and P. I. Maddieson, The Sounds of the World's Languages, 1996.

T. A. Bryan, The Non-Bantu Languages of North- Eastern Africa (with a Supplement on The Non-Bantu languages of Southern Africa by, 1956.