Leedy, Paul D. Practical research : planning and design / Paul D. Leedy. - 6th ed. - Upper Saddle River, New Jersey : Merrill Prentice Hall, c1997. - xvi, 304 p. : ill. ; 27 cm. Includes bibliographical references ISBN: 0132414074 Subjects--Topical Terms: Research--Methodology. LC Class. No.: Q180.55 / M4L51 1997