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) ·

Ethnologue: Languages of the World, 16th Edition (2009) . (2009) · edited by M. Paul Lewis · SIL International http://www.ethnologue.com/

Africa ( ch. 7 ) . Gerrit J. Dimmendaal and F. K. Erhard Voeltz (2007) · In Encyclopedia of the World's Endangered Languages edited by Christopher Moseley · Routledge

Le kpatiri ou gbayi, une nouvelle langue du groupe ngbandi ( pp. 35-49 ) . Boyd, Raymond (1988) · In Lexique comparatif des langues oubanguiennes edited by Moñino, Yves · Libr. Orientaliste Paul Geuthner; Laboratoire de Langues et Civilisations à Tradition Orale (LACITO); Dépt. Languages et Parole en Afrique Central (LAPAC)