APA引文

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

Chicago Edition Citation

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

MLA引文

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

警告：這些引文格式不一定是100％准確.