Παραπομπή APA

Longwell, C. R. (1957). Outlines of physical geology (2nd ed.). John willey & sons.

Παραπομπή Chicago Style

Longwell, Chester R. Outlines of Physical Geology. 2nd ed. New york: John willey & sons, 1957.

Παραπομπή MLA

Longwell, Chester R. Outlines of Physical Geology. 2nd ed. John willey & sons, 1957.