1. Brockleman, W.Y., Ali, R. 1987. Methods of surveying and sampling forest primate populations. In: C.W. Marsh, R.A. Mitermeier (Eds.), Primate Conservation in the Tropical Rain Forest. Alan R. Liss, New York, 23–62.
2. Distance Sampling: Estimating Abundance of Biological Populations;Buckland,1993
3. Estimation of densities from line transect sampling of biological populations;Burnham;Wildlife Monographs,1980
4. The Conservation Atlas of Tropical Forests; Asia and the Pacific;Collins,1990
5. Matman: a programme for the analysis of sociometric matrices and behavioural transition matrices;de Vries;Behaviour,1993