APA (7th ed.) Citation

United States. Post Office Department. (1913). Postal laws and regulations of U.S.A. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Postal Laws and Regulations of U.S.A. [Washington]: GPO, 1913.

MLA (9th ed.) Citation

United States. Post Office Department. Postal Laws and Regulations of U.S.A. GPO, 1913.

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