APA Citatie

Hettner, A. (1972). Surface features of the land: Problems and methods of geomorphology. Macmillan.

Chicago Style citaat

Hettner, Alfred. Surface Features of the Land: Problems and Methods of Geomorphology. London: Macmillan, 1972.

MLA citatie

Hettner, Alfred. Surface Features of the Land: Problems and Methods of Geomorphology. Macmillan, 1972.

Let op: Deze citaties zijn niet altijd 100% accuraat.