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Grove, A.T.; Nicole (2007) [1958]. "The Ancient Erg of Hausaland, and Similar Formations on the South Side of the Sahara". The Geographical Journal. 124 (4): 528–533. doi:10.2307/1790942. JSTOR1790942.
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Templeton, A. (2016). "Evolution and Notions of Human Race". In Losos, J.; Lenski, R. (eds.). How Evolution Shapes Our Lives: Essays on Biology and Society. Princeton; Oxford: Princeton University Press. pp. 346–361. doi:10.2307/j.ctv7h0s6j.26Archived 27 November 2021 at the Wayback Machine