Gay, L. R. Educational research : competencies for analysis and applications / L.R. Gay, Peter Airasian - 7th ed. - Upper Saddle River, N.J. : Merrill/Prentice Hall, c2003 - xvii, 605 p. : ill. (some col.) ; 26 cm. Includes bibliographical references and indexes. ISBN: 0130994634 Subjects--Topical Terms: Education--Research. Dewey Class. No.: 370.72 / GAY