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) ·

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

LL-MAP (Language and Location: A Map Accessibility Project) . Anthony Aristar and Helen Aristar-Dry and Yichun Xie (2012) · http://llmap.org

The Tonal Behaviour of one Class of Singular-Forming Nuns in the Kamda Language ( pp. 173-181 ) . Edward Hall (2006) · In Insights into Nilo-Saharan Language, History and Culture: Proceedings of the 9th Nilo-Saharan Linguistic Colloquium, Institute of African and Asian Studies, University of Khartoum, 16-19 February 2004 edited by Al-Amin Abu-Manga and Leoma Gilley and Anne Storch · Rüdiger Köppe

The Kadu languages and their affiliation: between Nilo-Saharan, Niger-Congo and Afro-Asiatic ( pp. 101-127 ) . Blench, Roger M. (2006) · In Insights into Nilo-Saharan language, history and culture: proceedings of the 9th Nilo-Saharan linguistic colloquium, Institute of African and Asian Studies, University of Khartoum, 16-19 February 2004 Nilo-Saharan: linguistic analyses and documentation (NISA), #23 · edited by Abu-Manga, Al-Amin and Gilley, Leoma G. and Storch, Anne · Rüdiger Köppe Verlag

A Phonological Comparison in the Katcha-Kadugli Language Group of the Nuba Mountains ( pp. 153-172 ) . Dafalla, Rihab Yahia (2006) · In Insights into Nilo-Saharan Language, History and Culture: Proceedings of the 9th Nilo-Saharan Linguistic Colloquium, Institute of African and Asian Studies, University of Khartoum, 16-19 February 2004 Nilo-Saharan · Vol. 23 · edited by Al-Amin Abu-Manga and Leoma Gilley and Anne Storch · Köln: Rüdiger Köppe