Robin Thelwall and Thilo Schadeberg. 1983. "The Linguistic Settlement of the Nuba Mountains." In Sprache und Geschichte in Afrika, 5: 219-231.
Teferra, A. and P. Unseth. 1989. "Toward the Classification of Shabo (Mikeyir)." In Topics in Nilo-Saharan Linguistics, edited by M. Lionel Bender. 3: 405-418. Hamburg: Helmut Buske.
Teferra, Anbessa. 1991. "A Sketch of Shabo Grammar." In Proceedings of the Fourth Nilo-Saharan Linguistics Colloquium, edited by M. Lionel Bender. 7: 371-387. Hamburg: Helmut Buske.