Stevenson, Roland C. 1991. "Relationship of Kadugli-Krongo To Nilo-Saharan: Morphology and Lexis." In Proceedings of the Fourth Nilo-Saharan Linguistics Colloquium, edited by M. Lionel Bender. 7: 347-369. Hamburg: Helmut Buske.

Stennes, L. H. A Reference Grammar of Adamawa Fulani. PhD thesis, Michigan State University, 1967.

Tanya Spronk. 2004. "A Brief Description of Current Talodi Orthographies." In Occasional Papers in the Study of Sudanese Languages, 9: 119-126.

Spellenberg, Friedrich. 1922. "Die Sprache Der Blineundero." 3: Berlin: Verlag von Dietrich Reimer (Ernst Vohsen).

Soukka, Maria. 2000. "A Descriptive Grammar of Noon: A Cangin Language of Senegal." 40: München: Lincom.

Sommer, G. and Rainer Vossen. 1992. "Schalzwörter Im Yei (R41)." In AuU, 75: 1-42.

Sommer, Gabi [Gabriele] and Rainer Vossen. 1995. "Linguistic Variation in Siyeyi." In The complete linguist: papers in memory of Patrick J. Dickens, edited by Anthony Traill et al.. 407-479. Köln: Rüdiger Köppe Verlag.

Snyman, Jan W. 1997. "Internal and External Relations of Khoe-Khoe Dialects: A Preliminary Survey." In Namibian Languages: Reports and Papers, edited by W. H. G. Haacke and E. D. Elderkin. 4: 21-106. Köln: Rüdiger Köppe.

Snyman, Jannie W. 1970. "An Introduction To the !Xũ (!Kung) Language." Department of African Languages, School of African Studies, University of Cape Town.

Snyman, J. W. 2000. "Palatalisation in the Tsowaa and G||ana Languages of Central Botswana." In The State of Khoesan Languages in Botswana, edited by Herman M. Batibo and J. Tsonope. 33-43. Mogoditshane, Botswana: Basarwa Languages Project, University of Botswana/University of Tromsø, Tasalls Publishing and Books.