एपीए उद्धरण

Cunningham, W. P. (2005). Environmental Science: A Global Concern with OLC (Hardcover). New York: McGraw-Hill.

शिकागो स्टाइल उद्धरण

Cunningham, William P. Environmental Science: A Global Concern With OLC (Hardcover). New York: McGraw-Hill, 2005.

एमएलए उद्धरण

Cunningham, William P. Environmental Science: A Global Concern With OLC (Hardcover). New York: McGraw-Hill, 2005.