Demeny, P. G. (1981). The North-South income gap: A demographic perspective. Ajit Bhagat Memorial Trust.
Chicago-referens (17:e uppl.)Demeny, Paul George. The North-South Income Gap: A Demographic Perspective. Ahmedabad: Ajit Bhagat Memorial Trust, 1981.
MLA-referens (8:e uppl.)Demeny, Paul George. The North-South Income Gap: A Demographic Perspective. Ajit Bhagat Memorial Trust, 1981.
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