Cita APA
ebrary, Inc. (1993). Protecting visibility in national parks and wilderness areas. National Academy Press.
Citación estilo Chicago
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. Washington, D.C.: National Academy Press, 1993.
Cita MLA
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. National Academy Press, 1993.
Warning: These citations may not always be 100% accurate.