@book{120309,
	author = {Schain, Robert L. and Polner, Murray, jt. au.},
	title = {Obtención y empleo de medios de enseñanza económicos y gratuitos},
	publisher = {UTEHA},
	year = {1967.},
	series = {Manuales UTEHA, educación},
	address = {Mexico},
	edition = {1. ed.},
	note = {Translation of : Where to get and how to use free and inexpensive teaching aids.}
}