APA (7th ed.) Citation

United States. Department of the Interior. (1912). Proceedings of National Park Conference held at Yellowstone National Park, Sept. 11 and 12, 1911. GPO.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Proceedings of National Park Conference Held at Yellowstone National Park, Sept. 11 and 12, 1911. [Washington]: GPO, 1912.

MLA (9th ed.) Citation

United States. Department of the Interior. Proceedings of National Park Conference Held at Yellowstone National Park, Sept. 11 and 12, 1911. GPO, 1912.