Leedy, Paul D. Practical research : planning and design / Paul D. Leedy, Jean ne Ellis Ormrod. - 8th ed. - Upper Saddle River, N.J. : Prentice Hall, 2005. c1989. - xxiii, 319 p. : ill. ; 28 cm. Includes bibliographical references (p. 309-311) and index. ISBN: 0131108956 LCCN: 2003-066035 Subjects--Topical Terms: Research-- Methodology. Dewey Class. No.: 001.4