@book{31465,
	author = {Polit, Denise F. and Beck, Cheryl Tatano.},
	title = {Essentials of nursing research :},
	publisher = {Wolters Kluwer Health /Lippincott Williams & Wilkins,},
	year = {c2014 .},
	address = {Philadelphia :},
	edition = {8th ed.}
}