@book{175391,
	author = {Newman, Denis. and Griffin, Peg.},
	title = {La zona de construcción de conocimiento},
	publisher = {Ministerio de Educación y Ciencia},
	year = {1991.},
	series = {Educacion Infantil y Primaria},
	address = {Madrid},
	note = {Translation of: The construction zone}
}