Levitt, Steven D. Freakonomics : a rogue economist explores the hidden side of everything / Steven D. Levitt & Stephen J. Dubner. - New York : Harper Perennial, c2009. - xxvi, 315 p. ; 21 cm. "With new material, including an author Q & A" -- Cover. Includes bibliographical references and index. ISBN: 9780062312679 (pbk.) Subjects--Topical Terms: Economics--Psychological aspects.Economics--Sociological aspects. Dewey Class. No.: 330 LEV