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.
Čikaški stil citiranjaColby, Charles C., i Alice Foster. Economic Geography: Industries and Resources of the Commercial World. United States of America: United States of America Armed Forces, 1940.
MLA način citiranjaColby, Charles C., i Alice Foster. Economic Geography: Industries and Resources of the Commercial World. United States of America: United States of America Armed Forces, 1940.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.