APA (7th ed.) Citation

United States. Post Office Department. (1915). General scheme of Pennsylvania. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. General Scheme of Pennsylvania. [Washington]: GPO, 1915.

MLA (9th ed.) Citation

United States. Post Office Department. General Scheme of Pennsylvania. GPO, 1915.

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