James Stuart Olson: The Peoples of Africa: An Ethnohistorical Dictionary, Greenwood Publishing Group, 1996, ISBN 978-0-313-27918-8, S. 555 [2]
Mohamad Yakan (Hrsg.): Almanac of African Peoples and Nations, Verlag Transaction Publishers, 1999, ISBN 978-1-351-28930-6, S. 645 [3]
Emizet Francois Kisangani, Scott F. Bobb: Historical Dictionary of the Democratic Republic of the Congo, Ausgabe 3, Verlag Scarecrow Press, 2009, ISBN 978-0-8108-6325-5, S. 379–380 [4]
James Stuart Olson: The Peoples of Africa: An Ethnohistorical Dictionary, Greenwood Publishing Group, 1996, ISBN 978-0-313-27918-8, S. 317 [5]
James Stuart Olson: The Peoples of Africa: An Ethnohistorical Dictionary, Greenwood Publishing Group, 1996, ISBN 978-0-313-27918-8, S. 555 [6]