एपीए उद्धरण

Longwell, C. R. (1941). Outlines of physical geology. New York,London: J. Wiley & sons, inc.,Chapman & Hall, limited.

शिकागो स्टाइल उद्धरण

Longwell, Chester R. Outlines of Physical Geology. New York,London: J. Wiley & sons, inc.,Chapman & Hall, limited, 1941.

एमएलए उद्धरण

Longwell, Chester R. Outlines of Physical Geology. New York,London: J. Wiley & sons, inc.,Chapman & Hall, limited, 1941.