APA (7th ed.) Citation

United States. National Park Service. (1929). Circular of general information regarding Zion and Bryce Canyon National Parks, Utah. [U.S. G.P.O.].

Chicago Style (17th ed.) Citation

United States. National Park Service. Circular of General Information Regarding Zion and Bryce Canyon National Parks, Utah. [Washington, D.C.]: [U.S. G.P.O.], 1929.

MLA (9th ed.) Citation

United States. National Park Service. Circular of General Information Regarding Zion and Bryce Canyon National Parks, Utah. [U.S. G.P.O.], 1929.