@book{3306,
	author = {Freinet, Célestin,  and Dolors Bordas, María, },
	title = {Los métodos naturales / },
	publisher = {Fontanella ; Estela, },
	year = {1970.},
	series = {[Educación ; },
	address = {Barcelona : },
	note = {Notas al pie del texto.}
}