APA (7th ed.) Citation

Tilden, F. (1968). The National parks. A. A. Knopf.

Chicago Style (17th ed.) Citation

Tilden, Freeman. The National Parks. New York: A. A. Knopf, 1968.

MLA (9th ed.) Citation

Tilden, Freeman. The National Parks. A. A. Knopf, 1968.

Warning: These citations may not always be 100% accurate.