APA (7th ed.) Citation

United States. Department of the Interior. (2011). Rocky Mountain [Colorado] National Park. Project Gutenberg.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Rocky Mountain [Colorado] National Park. Project Gutenberg, 2011.

MLA (9th ed.) Citation

United States. Department of the Interior. Rocky Mountain [Colorado] National Park. Project Gutenberg, 2011.

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