APA (7e ed.) Bronvermelding
ebrary, Inc. (1993). Protecting visibility in national parks and wilderness areas. National Academy Press.
Chicago (17e ed.) Bronvermelding
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. Washington, D.C.: National Academy Press, 1993.
MLA (9e ed.) Bronvermelding
ebrary, Inc. Protecting Visibility in National Parks and Wilderness Areas. National Academy Press, 1993.
Let op: Deze citaties zijn niet altijd 100% accuraat.