Cita APA (7a ed.)

Keiter, R. B. (2013). To conserve unimpaired: The evolution of the National Park idea. Island.

Cita Chicago Style (17a ed.)

Keiter, Robert B. To Conserve Unimpaired: The Evolution of the National Park Idea. Washington: Island, 2013.

Cita MLA (8a ed.)

Keiter, Robert B. To Conserve Unimpaired: The Evolution of the National Park Idea. Island, 2013.