Cita APA (7a ed.)

Sellars, R. W. (1997). Preserving nature in the national parks: A history. Yale University Press.

Cita Chicago Style (17a ed.)

Sellars, Richard West. Preserving Nature in the National Parks: A History. New Haven: Yale University Press, 1997.

Cita MLA (9a ed.)

Sellars, Richard West. Preserving Nature in the National Parks: A History. Yale University Press, 1997.