THORNBURY, W. D. (1969). Principles of geomorphology.-- Ed.2. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)THORNBURY, William D. Principles of Geomorphology.-- Ed.2. New York: John Wiley and Sons, 1969.
Lua MLA (9ú heag.)THORNBURY, William D. Principles of Geomorphology.-- Ed.2. John Wiley and Sons, 1969.
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