ebrary, Inc. (1993). Protecting visibility in national parks and wilderness areas. National Academy Press.
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Citação norma Chicago
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. Washington, D.C.: National Academy Press, 1993.
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Citação norma MLA
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. National Academy Press, 1993.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.