@book{6666,
	author = {Spitzer, Dean R and Mazar, Natalio},
	title = {Formación de Conceptos  y Aprendizaje Temprano /},
	publisher = {Editorial Paidos,},
	year = {1978.},
	series = {Biblioteca de Psicopedagogia Paidos},
	address = {Buenos Aires :}
}