1. Abelson, A.E: Altitude sad Smear Biological and cultural effects. pp. 16-37 In: Hteelatt Adaptation. Vol. 2. A. Ilasu and K.C. Mallantra Mk, Indian Statistical Institute, Calcutta. (1984 a).
2. Baker, P.T.: The adaptive fitness of high altitude populations. pp. 317-350. In: The Biology of High Altitude Peoples. P.T. Baker (Ed.). Cambridge University Press, Cambridge (1978).
3. Baker, P.T. and Dun, I.S. Demographic variables as measures of biological adaptation: a case study of high altitude human populations. pp. 352-378. In: The Structure of Human Populations. G.A. Harrison and A.]. Boyce (Eds.). The Claredon Press, Oxford (1972).
4. Bangham, C.R.M.: Why reproduction is difficult at high altitude? pp. 1-15. In: Human Adaptation Vol. 2. A. Basu and K.C. Malhotra (Eds). Indian Statistical Institute, Calcutta (1984).
5. Basu, A., Gupta, R. and Mukhopadhyay, B.: Anthropological demography of populations of the Eastern Himalayas. pp. 343-364. In: The People of South Asia. J.R. Lukacs (Ed.). Plenum Press, New York (1984).