Polit, Denise F. Nursing research : principles and methods / Denise F. Polit, Bernadette P. Hungler. - 3rd ed. - Philadelphia : Lippincott, c1987. - xvii, 571 p. : ill. ; 25 cm. Includes bibliographies and index. ISBN: 0397546319 Subjects--Topical Terms: Nursing--Research--Methodology.Nursing.Research. LC Class. No.: RT81.5 / .P65 1987 National Library of Medicine Call No.: WY 20.5 P769n