Polit, Denise F. Essentials of nursing research : appraising evidence for nursing practice / Denise F. Polit, Cheryl Tato Beck - 9th ed. - Philadelphia : WOLTERS KLUWER HEALTH, c2018. - xxii, 442 p. : col. ill. ; 25 cm. Includes bibliographical references and index. ISBN: 9781496358356 1496351290 LCCN: 2016043994 Subjects--Topical Terms: Nursing--Research Dewey Class. No.: 610.73072 PO ES