APA (7th ed.) Citation

United States. Department of the Interior. (1920). Lunch hour at school. GPO.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Lunch Hour at School. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

United States. Department of the Interior. Lunch Hour at School. GPO, 1920.

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