Glenn, Mary E; Cords, Marina. «Hybridization between Red-tailed Monkeys (Cercopithecus ascanius) and Blue Monkeys (C. mitis) in East African Forests.». Springer US. Developments in Primatology: Progress and Prospects: 79-97. ISBN978-0-306-47346-3. doi:10.1007/0-306-48417-X_7|acessodata= requer |url= (ajuda)