@book{50227,
	author = {Pineda, Elia B. , and Alvarado, Eva Luz de,},
	title = {Metodología de la investigación /},
	publisher = {OPS,},
	year = {2008.},
	series = {Paltex para Ejecutivos de Programa de Salud ;},
	address = {Washington :},
	edition = {3a edición.}
}