APA (7. basım) Alıntı
ebrary, Inc. (1993). Protecting visibility in national parks and wilderness areas. National Academy Press.
Chicago Style (17. basım) Atıf
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. Washington, D.C.: National Academy Press, 1993.
MLA (9th ed.) Atıf
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. National Academy Press, 1993.
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