एपीए उद्धरण

Bernard W. Pipkin. (2008). Geology and the environment. Belmont, CA: Thomson Brooks/Cole.

शिकागो स्टाइल उद्धरण

Bernard W. Pipkin. Geology and the Environment. Belmont, CA: Thomson Brooks/Cole, 2008.

एमएलए उद्धरण

Bernard W. Pipkin. Geology and the Environment. Belmont, CA: Thomson Brooks/Cole, 2008.