एपीए उद्धरण

Keller, E. A. (2000). Environmental geology. Upper Saddle River, N.J: Prentice Hall.

शिकागो स्टाइल उद्धरण

Keller, Edward A. Environmental Geology. Upper Saddle River, N.J: Prentice Hall, 2000.

एमएलए उद्धरण

Keller, Edward A. Environmental Geology. Upper Saddle River, N.J: Prentice Hall, 2000.