@book{161695,
	author = {Polit, Denise F. and Hungler, Bernadette P.},
	title = {Investigación científica en ciencias de la salud},
	publisher = {McGraw-Hill Interamericana},
	year = {1997.},
	address = {México},
	edition = {5ta. ed.},
	note = {Translation of: Nursing research: principles and methods .}
}