Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Seasonal Variation in the Feeding Ecology of the Grey-cheeked Mangabey (Lophocebus albigena) in Cameroon, JOHN R. POULSEN, CONNIE J. CLARK, AND THOMAS B. SMITH, American Journal of Primatology 54:91–105 (2001)