एपीए उद्धरण

Boehm, R. G. (2002). Geography the World and it's People volume 1. McGraw - HillCompanies, Inc.

शिकागो स्टाइल उद्धरण

Boehm, Richard G. Geography the World and It's People Volume 1. McGraw - HillCompanies, Inc, 2002.

एमएलए उद्धरण

Boehm, Richard G. Geography the World and It's People Volume 1. McGraw - HillCompanies, Inc, 2002.