Polit, Denise F. Essentials of nursing research : methods, appraisals, and utilization / Denise F. Polit, Bernadette P. Hungler. - 4th ed. - Philadelphia, Pa. : Lippincott-Raven, 1997. - 530 p. : ill. ; 24 cm. Includes bibliographical references and indexes. ISBN: 0397553684 (alk. paper) LCCN: 96028545 Subjects--Topical Terms: Nursing--Research LC Class. No.: RT81.5 Dewey Class. No.: 610.73/072