1. Blaug, Mark (1981). ?The economic costs and benefits of overseas students? in P. Williams (ed.), The Overseas Student Question: Studies for a Policy. London: Heinemann for the Overseas Students Trust.
2. Grant, W. and Eden, L. J. (1982). Digest of Education Statistics 1982. Washington, DC: U.S. Government Printing Office.
3. Oxenham, John (1981). ?Study abroad and development policy - an enquiry? in P. Williams (ed.), The Overseas Student Question: Studies for a Policy. London: Heinemann for the Overseas Students Trust.
4. Phillips, H. M. (1976). Educational Cooperation Between Developed and Developing Countries. New York: Praeger.
5. Psacharopoulos, G. (1975). ?Estimating some key parameters in the brain drain taxation model,? Journal of Development Economics 2(3): 309?318.