APA (7th ed.) Citation

United States. Post Office Department. (1914). General scheme of Illinois. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. General Scheme of Illinois. [Washington]: GPO, 1914.

MLA (9th ed.) Citation

United States. Post Office Department. General Scheme of Illinois. GPO, 1914.

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