Petersen, James F. Physical geography / James F. Petersen, Dorothy Sack, Robert E. Gabler. - 10th ed. - Belmont, CA : Brooks/Cole Cengage Learning, 2012. - xxiv, 646 p. : col. ill. ; 29 cm. Previous ed. : Essentials of physical geography. Includes bibliographical references and index. ISBN: 9781111427504 LCCN: 2011930759 Dewey Class. No.: 910.02 / PET