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

Les Furu et leurs Voisins: Découverte et essai de classification d'un groupe de langues en voie d'extinction au Cameroun ( pp. 17-48 ) . Roland Breton (1995) · Cahiers des Sciences Humaines. 31 (1) ·

Is there a Furu language group? ( pp. 97-118 ) . Breton, Roland J.L. (1993) · Journal of West African languages. 23 (2) ·