Leedy, Paul D. Practical research : planning and design / Paul D. Leedy, Jeanne Ellis Ormrod. - 8th ed. - Upper Saddle River, NJ : Merrill, c2005 - xvii, 336 p. : ill., maps ; 28 cm. Includes bibliographical references and index. ISBN: 9780137152421 (alk. paper) 0137152426 (alk. paper) LCCN: 2008055938 Subjects--Topical Terms: Research--Methodology. LC Class. No.: Q180.55.M4 / L43 2010 Dewey Class. No.: W 310 / L3