B. Caron, Gùùs, aka Sigidi (Chadic, West-B, South-Bauchi): Grammatical notes and vocabulary, Afrika und Übersee, vol.84, 2002.

P. R. Newman and . Schuh, The Hausa aspect system, Afroasiatic Linguistics, vol.1, pp.1-39, 1974.

N. Schneeberg, Sayanci verb tonology, Newman. Journal of African Languages, 1971.

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