APA (7th ed.) Citation

Colby, C. C. (1921). Source book for the economic geography of North America. The University of Chicago press.

Chicago Style (17th ed.) Citation

Colby, Charles C. Source Book for the Economic Geography of North America. Chicago, Ill.: The University of Chicago press, 1921.

MLA (9th ed.) Citation

Colby, Charles C. Source Book for the Economic Geography of North America. The University of Chicago press, 1921.