Leedy, Paul D. Practical research : planning and design / Paul D. Leedy. - 4th ed. - New York : Macmillazn Pub., c1989. - xi, 318p. : ill. ; 28 cm. Includes bibliographical references and index. ISBN: 0023692413 Subjects--Topical Terms: Research--Methodology LC Class. No.: Q180.55 / M4L51 1989