Ary, Donald. Introduction for research in education / Donald Ary, Lucy Cheser Jacobs, Asghar Razavieh. - 6th ed. - Belmont, CA : Wadsworth, c2002. - xxvi, 582 p. : ill. ; 24 cm. Includes bibliographical references and index. ISBN: 0534246656 9780534246655 LCCN: 2001033155 Subjects--Topical Terms: Education research. LC Class. No.: LB1028 / .A7 2002 Dewey Class. No.: 370/.7/2