APA (7th ed.) Citation

United States. Department of the Interior. (1918). Educational directory, 1918-19. GPO.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Educational Directory, 1918-19. [Washington]: GPO, 1918.

MLA (9th ed.) Citation

United States. Department of the Interior. Educational Directory, 1918-19. GPO, 1918.

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