Glaser, W. A., & Habers, G. C. (1978). The brain drain: Emigration and return : findings of a UNITAR multinational comparative survey of professional personnel of developing countries who study abroad. Pergamon Press.

Glaser, William A., and G. Christopher Habers. The Brain Drain: Emigration and Return : Findings of a UNITAR Multinational Comparative Survey of Professional Personnel of Developing Countries Who Study Abroad. Oxford: Pergamon Press, 1978.

Glaser, William A., and G. Christopher Habers. The Brain Drain: Emigration and Return : Findings of a UNITAR Multinational Comparative Survey of Professional Personnel of Developing Countries Who Study Abroad. Pergamon Press, 1978.