एपीए उद्धरण

(2009). Earth: An introduction to physical geology. Boston: Pearson.

शिकागो स्टाइल उद्धरण

Earth: An Introduction to Physical Geology. Boston: Pearson, 2009.

एमएलए उद्धरण

Earth: An Introduction to Physical Geology. Boston: Pearson, 2009.