APA (7th ed.) Citation

(2017). Skull Rock Trail: Joshua Tree National Park, California (Last updated July 14, 2017.). National Park Service, U.S. Department of the Interior.

Chicago Style (17th ed.) Citation

Skull Rock Trail: Joshua Tree National Park, California. Last updated July 14, 2017. [Twentynine Palms, Calif.]: National Park Service, U.S. Department of the Interior, 2017.

MLA (9th ed.) Citation

Skull Rock Trail: Joshua Tree National Park, California. Last updated July 14, 2017. National Park Service, U.S. Department of the Interior, 2017.