Ridker, R. G. (1976). Changing resource problems of the Fourth World. Resources for the Future ; distributed by the Johns Hopkins University Press.
Citace podle Chicago (17th ed.)Ridker, Ronald Gene. Changing Resource Problems of the Fourth World. Washington : Baltimore: Resources for the Future ; distributed by the Johns Hopkins University Press, 1976.
Citace podle MLA (8th ed.)Ridker, Ronald Gene. Changing Resource Problems of the Fourth World. Resources for the Future ; distributed by the Johns Hopkins University Press, 1976.
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