APA-referens (7:e uppl.)

- & KNAPP, B. [. (1981). Practical foundations of physical geograpgy. George Allaen and Unwin.

Chicago-referens (17:e uppl.)

- och Brian [Ed.] KNAPP. Practical Foundations of Physical Geograpgy. London: George Allaen and Unwin, 1981.

MLA-referens (9:e uppl.)

- och Brian [Ed.] KNAPP. Practical Foundations of Physical Geograpgy. George Allaen and Unwin, 1981.