APA (7e ed.) Bronvermelding
Tweed, W. C. (2010). Uncertain path: A search for the future of national parks. University of California Press.
Chicago (17e ed.) Bronvermelding
Tweed, William C. Uncertain Path: A Search for the Future of National Parks. Berkeley: University of California Press, 2010.
MLA (9e ed.) Bronvermelding
Tweed, William C. Uncertain Path: A Search for the Future of National Parks. University of California Press, 2010.
Let op: Deze citaties zijn niet altijd 100% accuraat.