APA (7th ed.) Citation

Keyes, N. B. (1957). America's national parks: A photographic encyclopedia of our magnificent natural wonderlands. Doubleday.

Chicago Style (17th ed.) Citation

Keyes, Nelson Beecher. America's National Parks: A Photographic Encyclopedia of Our Magnificent Natural Wonderlands. Garden City, N.Y.: Doubleday, 1957.

MLA (9th ed.) Citation

Keyes, Nelson Beecher. America's National Parks: A Photographic Encyclopedia of Our Magnificent Natural Wonderlands. Doubleday, 1957.