Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·

Endangered Languages in Central Africa ( pp. 163-178 ) . Bruce Connell (2007) · In Language Diversity Endangered edited by Matthias Brenzinger · Mouton de Gruyter

Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas

Languages of Wadai-Darfur ( pp. 43-79 ) . Paul Doornbos and Lionel M. Bender (1983) · In Nilo-Saharan language studies Monograph / Committee on Northeast African studies · Vol. 13 · edited by Bender, Marvin Lionel · East Lansing: African Studies Center, Michigan State Univversity

Les Gélé, Négrilles du Cameroun ( pp. 122-125 ) . C. Tastevin (1934) · L'Anthropologie. 28-29

Languages of Wadai-Darfur ( pp. 42-79 ) . Doornbos, Paul and Bender, Marvin Lionel (1983) · In Nilo-Saharan language studies Monographs from the Committee on Northeast African Studies, #13 · edited by Bender, Marvin Lionel · African Studies Center, Michigan State Univ.