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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

Benue-Congo Comparative Wordlist ( pp. 233 ) . (1968) · edited by Kay Williamson and Kiyoshi Shimizu · University of Ibadan, Nigeria: West African Linguistic Society

Ten More Wordlists with Analyses from the Northern Jos Group of Plateau Languages ( pp. 97-134 ) . Shimizu, Kiyoshi (1982) · Afrika und Übersee. LXV

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) ·