Não informado. (1994). International Journal of Sustainable Development and World Ecology. Parthenon Publishing.
Citace podle Chicago (17th ed.)Não informado. International Journal of Sustainable Development and World Ecology. Lancs, Inglaterra: Parthenon Publishing, 1994.
Citace podle MLA (8th ed.)Não informado. International Journal of Sustainable Development and World Ecology. Parthenon Publishing, 1994.
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