ALLISON, I. S. (1974). Geology: The science of a changing earth. McGraw-Hill.
Cita Chicago (17th ed.)ALLISON, Ira S. Geology: The Science of a Changing Earth. New York: McGraw-Hill, 1974.
Cita MLA (9th ed.)ALLISON, Ira S. Geology: The Science of a Changing Earth. McGraw-Hill, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.