Clutton-Brock, T.H. Feeding behaviour of red colobus and black and white colobus in East Africa. Folia Primatologica. 1975, 23 (3): 165–207. PMID 805763. doi:10.1159/000155671.
Clutton-Brock, T.H. Feeding behaviour of red colobus and black and white colobus in East Africa. Folia Primatologica. 1975, 23 (3): 165–207. PMID 805763. doi:10.1159/000155671.