A statistical overview of the Welsh language

Miehe, Gudrun and Winkelmann, Kerstin. 2007. Noun Class Systems in Gur Languages; Vol. I Southwestern Gur Languages (without Gurunsi). (Gur Monographs, 9.) In Miehe, Gudrun and Winkelmann, Kerstin (eds.) Köln: Rüdiger Köppe. 617pp.

Grimes, Barbara. 2003. "Ubangi Languages." In International Encyclopedia of Linguistics, edited by William Frawley. 1: 145-146. Oxford University Press.

Hackett, Peter and van Bulck, Gaston [Vaast]. 1956. Report of the Eastern Team: Oubangi to Great Lakes. In Guthrie, Malcolm and Tucker, Archibald N. (eds.), Linguistic Survey of the Northern Bantu Borderland, 63-122. Oxford University Press.

Crevels, Mily. 2012. Canichana. Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 415-449. La Paz: Plural Editores.

Haude, Katharina. 2012. Cayubaba. Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 375-413. La Paz: Plural Editores.

Crevels, Mily and Pieter Muysken. 2012. Cayubaba. Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 141-374. La Paz: Plural Editores.

Danielsen, Swintha. 2012. Baure. Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 295-339. La Paz: Plural Editores.

Guillaume, Antoine. 2012. Maropa (Reyesano). Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 191-229. La Paz: Plural Editores.

Emkow, Carola. 2012. Araona. Lenguas de Bolivia, vol 2: Amazonía, ed. by Mily Crevels and Pieter Muysken, 155-189. La Paz: Plural Editores.