1. Angst, W., 1973. Pilot experiments to test group tolerance to a stranger in wildMacaca fascicularis.Amer. J. Phys. Anthropol., 38: 625–630.
2. ————, 1975. Basic data and concepts on the social organization ofMacaca fascicularis. In:Primate Behavior, Developments in Field and Laboratory Research IV, Academic Press, New York, pp. 325–388.
3. Barnicot, N. A., P. T. Wade &P. Cohen, 1970. Evidence for a second haemoglobin α-locus duplication inMacaca irus.Nature (London), 228: 379–381.
4. Cavalli-Sforza, L. L. &W. F. Bodmer, 1971.The Genetics of Human Populations. Freeman, San Francisco.
5. Crockett, C. M. &W. L. Wilson, 1980. The ecological separation ofMacaca nemestrina andM. fascicularis in Sumatra. In:The Macaques: Studies in Ecology, Behavior and Evolution,D. G. Lindburg (ed.), Van Nostrand Reinhold, New York, pp. 148–181.