Cita APA (7a ed.)
ebrary, Inc. (1993). Protecting visibility in national parks and wilderness areas. National Academy Press.
Cita Chicago Style (17a ed.)
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. Washington, D.C.: National Academy Press, 1993.
Cita MLA (9a ed.)
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. National Academy Press, 1993.
Precaución: Estas citas no son 100% exactas.