(en) Michael Ayotte et Melinda Lamberty, Rapid Appraisal Sociolinguistic Survey among the Ngemba Cluster of Languages: Mankon, Bambili, Nkwen, Pinyin, and Awing. Bamenda, Santa, and Tubah Subdivisions, Mezam Division, North West Province, SIL International, , 50 p. (lire en ligne)
(en) Gratien Gualbert , Standardization and harmonization of Cameroonian languages, Cape Town, Centre for Advanced Studies of African Society (CASAS), 2003, (ISBN1-919799-93-1)