Colin P. Groves. Department of Archaeology and Anthropology, The Australian National University, GPO Box 4, Canberra ACT 0200, Australia
Wilson, Don E., and DeeAnn M. Reeder, eds. 1992-01-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing. Smithsonian Institution Press. Washington, DC, USA. xviii + 1207. 1-56098-217-9. Corrections were made to text at 3rd printing.
Wilson, Don E., and DeeAnn M. Reeder, eds. 2005-10-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vol. 1. Johns Hopkins University Press. Baltimore, Maryland, USA. xxxv + 743. 0-8018-8221-4. .
Mittermeier, Rusell A., Anthony B. Rylands, and Don E. Wilson, eds. 2013-01-01. Handbook of the Mammals of the World. Volume 3. Primates. Lynx Edicions. Barcelona, Spain. 951. 9788496553897. .
Wilson & Reeder, eds. (2005): Comments: This genus, according to M. Goodman et al. (2001) and to work in progress by C. P. Groves and M. Shekelle, should probably be split into two or three separate genera (for Sulawesi, Philippine, and Western groups)