APA (7th ed.) Citation

United States. National Park Service. (2016). Yellowstone National Park ; Grand Teton National Park (Revised September 2016.). National Park Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. Yellowstone National Park ; Grand Teton National Park. Revised September 2016. [Washington, D.C.]: National Park Service, 2016.

MLA (9th ed.) Citation

United States. National Park Service. Yellowstone National Park ; Grand Teton National Park. Revised September 2016. National Park Service, 2016.

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