Struhsaker, Thomas T. (1995). "Colobine monkeys: Their ecology, behaviour and evolution". International Journal of Primatology. 16 (6): 1035–1037. doi:10.1007/BF02696118. S2CID31026977.
Mittermeier, R.A.; Wallis, J.; Rylands, A.B.; Ganzhorn, J.U.; Oates, J.F.; Williamson, E.A.; Palacios, E.; Heymann, E.W.; Kierulff, M.C.M.; Long Yongcheng; Supriatna, J.; Roos, C.; Walker, S.; Cortés-Ortiz, L.; Schwitzer, C., eds. (2009). Primates in Peril: The World's 25 Most Endangered Primates 2008–2010(PDF). Arlington, VA.: IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), and Conservation International (CI). pp. 1–92. ISBN978-1-934151-34-1.
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Struhsaker, Thomas T. (1995). "Colobine monkeys: Their ecology, behaviour and evolution". International Journal of Primatology. 16 (6): 1035–1037. doi:10.1007/BF02696118. S2CID31026977.