Beck Cheryl Tatno. Polit Denise F. Nursing Research : Priniciples and Methods - 7th ed. - Philadelphia Lippincott Williams and Wilkins 2004 - 758 p. ISBN: 0781737338 Subjects--Topical Terms: NURSING RESEARCH -- METHODS / QUANTTATIVE RESEARCH National Library of Medicine Call No.: WY20.5 / P769N 2004