@book{10167,
	author = {Polit, Denise F. and Beck, Cheryl Tatano},
	title = {Nursing research : generating and assessing evidence for nursing practice},
	publisher = {Lippincott Williams & Wilkins},
	year = {2012},
	address = {Philadelphia},
	edition = {9 th ed},
	note = {Includes bibliographical references and index}
}