Olivier Walther: Sons of the Soil and Conquerors Who Came on Foot: The Historical Evolution of a West African Border Region. In: African Studies Quarterly. Vol. 13, Nr.1 & 2, 2012, S.77–78 (sites.clas.ufl.edu [PDF; abgerufen am 4. November 2018]).
Olivier Walther: Sons of the Soil and Conquerors Who Came on Foot: The Historical Evolution of a West African Border Region. In: African Studies Quarterly. Vol. 13, Nr.1 & 2, 2012, S.84 und 87 (sites.clas.ufl.edu [PDF; abgerufen am 4. November 2018]).