PITTY, A. F. (1982). The nature of geomorphology. Methuen.
Lua i Stíl Chicago (17ú heag.)PITTY, Alistair F. The Nature of Geomorphology. London: Methuen, 1982.
Lua MLA (9ú heag.)PITTY, Alistair F. The Nature of Geomorphology. Methuen, 1982.
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