@book{254,
	author = {Maier, Henry William.},
	title = {Tres teorias sobre el desarrollo del niño},
	publisher = {Amorrortu Editores},
	year = {1971.},
	address = {Buenos Aires},
	note = {Translation of : Three theories of child development : the contributions of Erik H. Erikson, Jean Piaget and Robert R. Sears and their applications.}
}