The Bung language is a nearly extinct, endangered language of Cameroon spoken by 3 people (in 1995) at the village of Boung on the Adamawa Plateau. It is remembered best by one speaker who is not a native speaker and learned the language at a young age. A wordlist collected for it shows its strongest resemblance to be with the Ndung dialect of Mambiloid languageKwanja, although that may simply be because this has become the dominant language of the village where Bung's last speakers reside. It also has words in common with other Mambiloid languages such as Tep, Somyev, and Vute, while a number of words' origins remain unclear (possibly Adamawan). For lack of data, it is not definitively classified.
Bendor-Samuel, J. T., & Perrin, M. (1971) A Note on Labialization in Mambila. In Actes du 8me Congres International de Linguistique Africaine I (Ann. Univ. Abidjan Ser. H.) (pp. 119-129).
Bennett, P., & Sterk, J. S. (1977) South Central Niger-Congo: a reclassification. Studies in African Linguistics, No. 8 241 - 273.
Connell, B. (1995). "Dying Languages and the Complexity of the Mambiloid Group". Paper presented at the 25th Colloquium on African Languages and Linguistics, Leiden.
Connell, B. (2007). Endangered Languages in Central Africa. In M. i. Brenzinger (Ed.) , Language Diversity Endangered (pp. 163-178). Berlin, Germany: Mouton de Gruyter. doi:10.1515/9783110197129.163
Greenberg, J. H. (1974) Bantu and its closest relatives. Studies in African Linguistics, Suppl. 5 115-124.
Hedinger, R. (1989) Northern Bantoid. In J. T. Bendor-Samuel (Ed.), The Niger-Congo Languages (pp. 421-429). Lanham MD: University Press of America.
Kouega, J. (2008). Minority language use in Cameroon and educated indigenes' attitude to their languages. International Journal Of The Sociology Of Language, 2008(189), 85-113. doi:10.1515/IJSL.2008.004
Kouega, J. (2007). The Language Situation in Cameroon. Current Issues In Language Planning, 8(1), 3. doi:10.2167/cilp110.0
Risnes, O. (1989) Report of the linguistics and sociolinguistic survey among the Kwanja (Konja). In S.I.L. Cameroon, Annual Report 1988-1989 (pp. 31-38). Yaoundé: Société Internationale de Linguistique, Yaoundé.
Whalen, D. H. & Simons, G. F.(2012). Endangered language families. Language 88(1), 155-173. Linguistic Society of America. Retrieved February 11, 2015, from Project MUSE database