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♦ ¹Feeding Ecology of Mandrills (Mandrillus sphinx) in Campo Animal Reserve, Cameroon, JIRO HOSHINO, PRIMATES, 26(3): 248-273, July 1985
♦ ²Breeding and nest site characteristics of the Black-casqued Hornbill Ceratogymna atrata and White-thighed Hornbill Ceratogymna cylindricus in south-central Cameroon, Donald J Stauffer and Thomas B Smith, Ostrich 2004, 75(3): 79–88