Hatton, T. J., & Williamson, J. G. (2001). Demographic and economic pressure on emigration out of Africa. National Bureau of Economic Research.
Citace podle Chicago (17th ed.)Hatton, Timothy J., a Jeffrey G. Williamson. Demographic and Economic Pressure on Emigration Out of Africa. Cambridge, Mass: National Bureau of Economic Research, 2001.
Citace podle MLA (9th ed.)Hatton, Timothy J., a Jeffrey G. Williamson. Demographic and Economic Pressure on Emigration Out of Africa. National Bureau of Economic Research, 2001.
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