* Carlson, Plummer, Hammersley. ''PHYSICAL GEOLOGY: Earth Revealed''. 9th edition. New York: The McGraw-Hill Companies, Inc, 2011. ISBN 978-0-07-122184-9 | * Carlson, Plummer, Hammersley. ''PHYSICAL GEOLOGY: Earth Revealed''. 9th edition. New York: The McGraw-Hill Companies, Inc, 2011. ISBN 978-0-07-122184-9 |