Gay, L. R. Educational research : competencies for analysis and application / L.R. Gay. - 5th ed. - Upper Saddle River, N.J. : Merrill, c1996. - xxiv, 662 p. : ill. ; 27 cm. Includes bibliographical references and indexes. ISBN: 0023408146 LCCN: 95016730 Subjects--Topical Terms: Education--Research. LC Class. No.: LB1028 / .G25 1996 Dewey Class. No.: 370/.78