Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.