APA (7th ed.) Citation

Tilden, F., & Hartzog, G. B., Jr. (1979). The national parks (a revised & enlarged edition.). Alfred A. Knopf.

Chicago Style (17th ed.) Citation

Tilden, Freeman, and George B. Hartzog, Jr. The National Parks. a revised & enlarged edition. New York: Alfred A. Knopf, 1979.

MLA (8th ed.) Citation

Tilden, Freeman, and George B. Hartzog, Jr. The National Parks. a revised & enlarged edition. Alfred A. Knopf, 1979.

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