एपीए उद्धरण

Gabler, R. E. (2004). Essentials of physical geography. Belmont, CA: Thomson Books/Cole.

शिकागो स्टाइल उद्धरण

Gabler, Robert E. Essentials of Physical Geography. Belmont, CA: Thomson Books/Cole, 2004.

एमएलए उद्धरण

Gabler, Robert E. Essentials of Physical Geography. Belmont, CA: Thomson Books/Cole, 2004.