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Anderson, Mark (2009-11-12). "Vulture crises in South Asia and West Africa … and monitoring, or the lack thereof, in Africa". Ostrich: Journal of African Ornithology. 78 (2): 415–416. doi:10.2989/OSTRICH.2007.78.2.47.127. S2CID84365762.
Fa, John E.; Seymour, Sarah; Dupain, Jef; Amin, Rajan; Albrechtsen, Lise; MacDonald, David (2006-05-01). "Getting to grips with the magnitude of exploitation: Bushmeat in the Cross–Sanaga rivers region, Nigeria and Cameroon". Biological Conservation. 129 (4): 497–510. doi:10.1016/j.biocon.2005.11.031. ISSN0006-3207.