APA (7th ed.) Citation

United States. Department of the Interior. (1915). Educational directory, 1915-16. GPO.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Educational Directory, 1915-16. [Washington]: GPO, 1915.

MLA (9th ed.) Citation

United States. Department of the Interior. Educational Directory, 1915-16. GPO, 1915.

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