Alexandersson, G., & Klevebring, B. (1978). World resources: Energy, metals, and minerals : studies in economic and political geography. W. de Gruyter.
Citace podle Chicago (17th ed.)Alexandersson, Gunnar, a Bjorn-Ivar Klevebring. World Resources: Energy, Metals, and Minerals : Studies in Economic and Political Geography. Berlin: W. de Gruyter, 1978.
Citace podle MLA (9th ed.)Alexandersson, Gunnar, a Bjorn-Ivar Klevebring. World Resources: Energy, Metals, and Minerals : Studies in Economic and Political Geography. W. de Gruyter, 1978.
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