APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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