Jeff Good and Pierpaolo DiCarlo. 2012. "What Are We Trying To Preserve? Diversity, Change, and Ideology At the Edge of the Cameroonian Grassfields." Online: http://www.acsu.buffalo.edu/~jcgood/DiCarloGood-LFIdeology.pdf.
Marianne Iberg. Essai De Description Du Système Verbal Du Parler Kuasap, Mayo-Kebbi (Tchad). Master thesis, Paris: Université de la Sorbonne nouvelle III, 1990.
Kerstin Winkelmann. 1994. "Les Classes Nominales Et Le Système D'affixation En Khe (langue Voltaïque)." In Mitteilungen des Sonderforschungsbereichs 268: Burkina Faso und Nordostnigeria, edited by Herrmann Jungraithmayr and Gudrun Miehe. Rüdiger Köppe.
Marti Marianne. 2012. "Enquête Sociolinguistique De La Langue Koulfa Du Tchad (rapport Technique)." SIL. Online: http://www.sil.org/silesr/2012/silesr2012-022_FINAL.pdf.
Raimund Kastenholz and Ulrich Kleinewillinghöfer. 2012. "Nimbari As a Language Name." Online: http://www.blogs.uni-mainz.de/fb07-adamawa/files/2012/06/Nimbari.pdf.
Kenneth S. Olson. 2004. "Mono." In Journal of the International Phonetic Association, 2: Online: http://www.sil.org/acpub/repository/Olson2004.pdf.