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) ·

Sociolinguistic Survey of the Kabalay Language of Chad . Cameron Hamm (2002) · http://www.sil.org/silesr/2003/silesr2003-008.pdf

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

Document sur les Langues de l'Oubangui-Chari ( pp. 172-330 ) . Maurice Gaudefroy-Demombynes (1907) · In Actes du XVIe Congrès International des Orientalistes, Alger, 1905 Paris: Ernest Leroux

The valleys of the Upper Wage and Lai rivers, Western Highlands, New Guinea ( pp. 90-135 ) . M. J. Meggitt (1956) · Oceania. 27 (2) ·