1. Albrecht, G. H. (1978). The Craniofacial Morphology of the Sulawesi Macaques. Multivariate Approaches to Biological Problems.Contrib. Primatol. 13: 1–151.
2. Ali, R. (1985). An overview of the status and distribution of the lion-tailed macaque. In Heltne, P. G. (ed.)The Lion-tailed Macaque: Status and Conservation. Alan R. Liss, New York, pp. 13–25.
3. Baker, H. G. (1965). Characteristics and modes of origin of weeds. In Baker, H. G., Stebbins, G. L. (eds.),The Genetics of Colonizing Species. Academic, New York, pp. 147–172.
4. Bakar, A., Amir, M. and Marshal (1981). Morphological studies on the crab-eating monkeys in Indonesia.Kyoto University Overseas Report of Studies on Indonesian Macaque 1: 11–14.
5. Baker, H. G. (1974). The evolution of weeds.Ann. Rev. Ecol. Syst. 5: 1–24.