Gay, L. R. Educational research : competencies for analysis and applications / L.R. Gay, Geoffrey E. Mills, Peter Airasian. - 8th ed. - Upper Saddle River, N.J. : Pearson Merrill Prentice Hall, c2006. - xix, 614 p. : ill. ; 27 cm. Includes bibliographical references and indexes. ISBN: 0131185349 LCCN: 2005048673 Subjects--Topical Terms: Education--Research. LC Class. No.: LB1028 / .G37 2006 Dewey Class. No.: 370.72/ / GAY