Citazione Stile APA (7a Edizione)
Tweed, W. C. (2010). Uncertain path: A search for the future of national parks. University of California Press.
Citazione stile Chigago Style (17a edizione)
Tweed, William C. Uncertain Path: A Search for the Future of National Parks. Berkeley: University of California Press, 2010.
Citatione MLA (9a ed.)
Tweed, William C. Uncertain Path: A Search for the Future of National Parks. University of California Press, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.