↑Elizabeth L. Gadsby, Colin P. Groves, Aoife Healy, K. Praveen Karanth, Sanjay Molur, Tilo Nadler, Matthew C. Richardson, Erin P. Riley, Anthony B. Rylands, Lori K. Sheeran, Nelson Ting, Janette Wallis, Siân S. Waters & Danielle J. Whittaker: Family Cercopithecidae (Old World Monkeys). Seite 710 in Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson: Handbook of the Mammals of the World: - Volume 3. Primates. Lynx Editions, 2013 ISBN978-8496553897
↑Jonathan Kingdon, David Happold, Michael Hoffmann, Thomas Butynski, Meredith Happold und Jan Kalina (Hrsg.): Mammals of Africa Volume II: Primates, Bloomsbury, London, 2013 ISBN978-1-4081-2252-5
↑Nelson Ting: Molecular systematics of red colobus monkeys (Procolobus [Piliocolobus]): Understanding the evolution of an endangered primate. PhD thesis, City University of New York, 2008, New York.