H. Jungraithmayr, D. Et, and . Ibriszimow, Chadic Lexical Roots. I: Tentative Reconstruction, Grading, Distribution and Comments. II: Documentation, 1994.

K. Shimizu, The Southern Bauchi Group of Chadic Languages. A survey report, Africana Marburgensia Special Issue, issue.2, p.50, 1978.

N. Schneeberg, Sayanci verb tonology, Journal of African Languages. Special Chadic Issue, vol.10, issue.1, pp.87-100, 1971.

N. Schneeberg, Sayanci Phonology, 1974.