@book{291437,
	author = {Hernández Sampieri, Roberto and Fernández Collado, Carlos},
	title = {Metodología de la investigación / Roberto Hernández Sampieri ; Carlos Fernández Collado ; María del Pilar Baptista Lucio},
	publisher = {Mcgraw-Hill},
	year = {2010},
	address = {México},
	edition = {5a ed.}
}