@book{21997,
	author = {Pestalozzi, Johann Heinrich, and Villalpando, José Manuel },
	title = {Canto del cisne /},
	publisher = {Porrúa },
	year = {2004},
	series = {Sepan cuantos...;},
	address = {México },
	edition = {3a ed.},
	note = {Traducción de: Schwanengesang.}
}