Polit, Denise F. Essentials of nursing research : appraising evidence for nursing practice. - 7th ed. - Philadelphia : Lippincott Williams & Wilkins, 2010. - xiv, 610 p. ill. 24.5 cm. Includes bibliographical references and index. ISBN: 0781781531 9780781781534 Subjects--Topical Terms: Nursing research National Library of Medicine Call No.: WY 20.5 PE 2010