Tonelli, Livia. 1999. "The Garre of Somalia: a Sketch of Its Linguistic Features." In Afroasiatica tergestina: papers from the 9th Italian meeting of Afro-Asiatic (Hamito-Semitic) linguistics, Trieste, April 23-24, 1998, edited by Marcello Lamberti and Livia Tonelli. 373-379. Unipress.

Tompkins, Barbara and Angela Kluge. 2009. "A Sociolinguistic Survey of the Anii-Akpe Language Area." 96. SIL International.

Tompkins, Barbara and Angela Kluge. 2002. "Sociolinguistic Survey of the Chakali Language Area." 37. SIL International.

Mohand Tilmatine. 1991. "Tabelbala: Eine Songhaysprachinsel in Der Algerischen Sahara." In Ägypten im Afro-orientalischen Kontext. Aufsätze zur Archäologie, Geschichte und Sprache eines unbegrenzten Raumes: Gedenkschrift Peter Behrens, edited by Daniela Mendel and Ulrike Claudi. 377-397. Inst. für Afrikanistik, Univ. zu Köln.

Eric Ten Raa. 1986. "The Alagwa: a Northern Intrusion in a Tanzanian Khoi-San Culture, As Testified Through Sandawe Oral Tradition." In Contemporary studies on Khoisan: in honour of Oswin Köhler on the occasion of his 75th birthday, edited by Rainer Vossen and Klaus Keuthmann. v. 2: 271-299. Helmut Buske Verlag.

Stevenson, Roland C. 1964. "Linguistic Research in the Nuba Mountains [pt. 2]." In Sudan notes and records, 45: 79-102.

Stevenson, Roland C. 1963. "Some Aspects of the Spread of Islam in the Nuba Mountains." In Sudan notes and records, 64: 9-20.

Stevenson, Roland C. 1956/57. "A Survey of the Phonetics and Grammatical Structure of the Nuba Mountain Languages, with Particular Reference To Otoro, Katcha and Nyimang [pt. 1-2]." In Afrika und Übersee, 40: 73-84, 93-115.

Gabi Sommer and Rainer Vossen. 2000. "Language Gain and Language Loss: the Spread of Setswana in Ngamiland." In Botswana: The Future of the Minority Languages, edited by Herman M. Batibo and Birgit Smieja. 40: 129-153. Peter Lang.

Gabriele Sommer. 1992. "A Survey On Language Death in Africa." In Language death: factual and theoretical explorations with special reference to East Africa, edited by Matthias Brenzinger. 402. Mouton de Gruyter.