Schadeberg, Thilo C. 1981. A survey of Kordofanian I: The Heiban group. Hamburg: Helmut Burske Verlag.
@misc{9068, author = {Schadeberg, Thilo C.}, title = {A survey of Kordofanian I: The Heiban group. Hamburg: Helmut Burske Verlag.}, year = {1981} }