Gay, Lorraine Rumbel Educational research : competencies for analysis and application / L. R. Gay. - 5th ed. - Englewood Cliffs, N. J. : Prentice Hall, c1996. - xxiv, 662p. : ill. ; 26 cm. Includes bibliographical references and index. ISBN: 0023408140 Subjects--Topical Terms: Education--Research LC Class. No.: LB1028 / G25 1996