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Citace podle Chicago (17th ed.)Worldwatch Institute a Lester Russell Brown. State of the World 1990: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W. W. Norton and Company, 1990.
Citace podle MLA (9th ed.)Worldwatch Institute a Lester Russell Brown. State of the World 1990: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W. W. Norton and Company, 1990.
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