Παραπομπή APA

Twidale, C. R. (1976). Analysis of landforms. John Wiley.

Παραπομπή Chicago Style

Twidale, C. R. Analysis of Landforms. Sydney: John Wiley, 1976.

Παραπομπή MLA

Twidale, C. R. Analysis of Landforms. John Wiley, 1976.