@book{61564,
	author = {Polit, Denise F and Beck, Cheryl Tatano},
	title = {Study guide for Essentials of nursing research: appraising  evidence for nursing practice /},
	publisher = {Wolters Kluwer Health/Lippincott, Williams & Wilkins,},
	year = {2010},
	address = {Philadelphia :},
	edition = {7th ed}
}