APA (7th ed.) Citation

(1931). Flags: Colors, standards, and guidons; description and use. GPO.

Chicago Style (17th ed.) Citation

Flags: Colors, Standards, and Guidons; Description and Use. [Washington]: GPO, 1931.

MLA (9th ed.) Citation

Flags: Colors, Standards, and Guidons; Description and Use. GPO, 1931.

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