@book{297451,
	author = {Hernández Sampieri, Roberto and Hernández Sampieri, Roberto},
	title = {Metodología de la investigación / Roberto Hernández Sampieri, Carlos Fernández Collado, María del Pilar Baptista Lucio},
	publisher = {Mcgraw-Hill},
	year = {2014},
	address = {México},
	edition = {6a ed.}
}