Polit, D. F. Nursing research : principles and methods / Denise F. Polit and Bernadette P. Hungler. - 3rd ed. - Philadelphia : Lippincott, 1987. - xvii, 571 p. : ill. ;Hbk ISBN: 0397546319 Subjects--Topical Terms: Nursing--Research--Methodology.Nursing.Research. LC Class. No.: RT81.5.P64 / 1987