@book{40654,
	author = {Hernández Sampiere, Roberto and Fernández Collado, Carlos},
	title = {Metodología de la Investigación /.},
	publisher = {McGrawHill,},
	year = {2014.},
	address = {Mexico D.F. :},
	edition = {6.},
	note = {Incluye: Índice analítico.}
}