@book{4893,
	author = {Gabrielsen, M. Alexander and Holtzer, Charles},
	title = {Educación al aire libre},
	publisher = {Troquel},
	year = {1971},
	series = {Biblioteca de la nueva educación},
	address = {Buenos Aires},
	edition = {1ª ed.},
	note = {Apéndice p. 141-144}
}