APA (7th ed.) Citation

United States. National Park Service. (1933). Plants of Rocky Mountain National Park. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Park Service. Plants of Rocky Mountain National Park. [Washington]: [s.n.], 1933.

MLA (9th ed.) Citation

United States. National Park Service. Plants of Rocky Mountain National Park. [s.n.], 1933.

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