1. Aldrich-Blake, F. P. G., in prog. Synecology ofHylobates andSymphalangus (project description). Bristol University, England.
2. ——, 1973. On the genesis of a group of siamang.Amer. J. Phys. Anthrop. 38: 631–636.
3. Biswas, S., 1970. White-browed gibbon (Hylobates hoolock Harlan) and capped langur (Presbytis pileatus Blyth) as a human food.J. Bengal Nat. Hist. Soc. 36: 78–80.
4. Carpenter, C. R., 1938a. A field study of the gibbon (Hylobates lar).Sci. Monthly. April, 319–325.
5. ——, 1940. A field study in Siam of the behavior and social relations of the gibbon (Hylobates lar).Comp. Psychol. Monogr. 16: 1–212. Also in:Naturalistic Behavior of Nonhuman Primates, C. R. Carpenter (ed.), Pennsylvania State University Press, University Park, 1964.