APA (7th ed.) Citation

United States. National Park Service. (1927). Petrified Forest National Monument, Ariz: Rules and regulations. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. National Park Service. Petrified Forest National Monument, Ariz: Rules and Regulations. Washington: U.S. GPO, 1927.

MLA (9th ed.) Citation

United States. National Park Service. Petrified Forest National Monument, Ariz: Rules and Regulations. U.S. GPO, 1927.

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