APA (7th ed.) Citation

United States. Post Office Department. (1921). Scheme of Illinois; Chicago, Ill. standpoint. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Scheme of Illinois; Chicago, Ill. Standpoint. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

United States. Post Office Department. Scheme of Illinois; Chicago, Ill. Standpoint. GPO, 1921.

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