Cita APA (7th ed.)

Tweed, W. C. (2010). Uncertain path: A search for the future of national parks. University of California Press.

Cita Chicago (17th ed.)

Tweed, William C. Uncertain Path: A Search for the Future of National Parks. Berkeley: University of California Press, 2010.

Cita MLA (9th ed.)

Tweed, William C. Uncertain Path: A Search for the Future of National Parks. University of California Press, 2010.