@book{31981,
	author = {Stake, R. E.},
	title = {Investigación con estudio de casos.},
	publisher = {Morata,},
	year = {1999.},
	series = {Pedagogía. Manuales},
	address = {Madrid :},
	edition = {2a ed.},
	note = {Esquemas educativos p. 150-151.}
}