@book{49821,
	author = {Mager, Robert Frank and Beach, Kenneth.},
	title = {Enseñanza de los oficios en la escuela vocacional},
	publisher = {Editorial Pax-México},
	year = {1972.},
	address = {México},
	edition = {1. ed.},
	note = {Translation of : Developing vocational instruction.}
}