Bahr, Damon L. Elementary mathematics is anything but elementary : content and methods from a developmental perspective / Damon L. Bahr, Lisa Ann de Garcia. - Australia : Wadsworth Cengage Learning, c2010. - xx, 517 p. : ill. (some col.) ; 28 cm. Includes bibliographical references and index. ISBN: 9781439046715 Subjects--Topical Terms: Mathematics--Study and teaching (Elementary) LC Class. No.: QA135.6 / .B33 2010 CIRC Dewey Class. No.: 372.7