ALLISON, I. S. (1974). Geology: The science of a changing earth. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)ALLISON, Ira S. Geology: The Science of a Changing Earth. New York: McGraw-Hill, 1974.
Lua MLA (9ú heag.)ALLISON, Ira S. Geology: The Science of a Changing Earth. McGraw-Hill, 1974.
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