Polit, Denise F. Essentials of nursing research : methods, appraisals, and utilization / Denise F. Polit, Bernadette P. Hungler. - 4th ed. - Philadelphia, Pa. : Lippincott-Raven, 1997. - xiv, 530 p. : ill. ; 24 cm. Includes bibliographical references and indexes. ISBN: 0397553684 Subjects--Topical Terms: NursingResearch LC Class. No.: WY20.5 Dewey Class. No.: 610.73/072