Johnson, Burke. Educational research : quantitative and qualitative approaches / Burke Johnson, Larry Christensen. - Boston : Allyn and Bacon, c2000. - xxi, 517 p. : ill. ; 23 cm. Includes bibliographical references and index. ISBN: 0205266592 (Hb : Photocopied) Subjects--Topical Terms: Education Research. LC Class. No.: LB1028 / .J63 2000