Breunig P, Neumann K, Van Neer W (June 1996). "New Research on the Holocene Settlement and Environment of the Chad Basin in Nigeria". African Archaeological Review. 13 (2): 111–145. doi:10.1007/BF01956304. JSTOR25130590.
Breunig P, Neumann K, Van Neer W (June 1996). "New Research on the Holocene Settlement and Environment of the Chad Basin in Nigeria". African Archaeological Review. 13 (2): 111–145. doi:10.1007/BF01956304. JSTOR25130590.