APA Citatie

Colby, C. C., & Foster, A. (1940). Economic geography: Industries and resources of the commercial world. United States of America: United States of America Armed Forces.

Chicago Style citaat

Colby, Charles C., en Alice Foster. Economic Geography: Industries and Resources of the Commercial World. United States of America: United States of America Armed Forces, 1940.

MLA citatie

Colby, Charles C., en Alice Foster. Economic Geography: Industries and Resources of the Commercial World. United States of America: United States of America Armed Forces, 1940.