Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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