@book{1607,
	author = {Piaget, Jean, and Inhelder, Bärbel.},
	title = {Génesis de las estructuras lógicas elementales},
	publisher = {Editorial Guadalupe},
	year = {1967.},
	series = {Biblioteca Pedagogica},
	address = {Buenos Aires},
	note = {Translation of : La genése des structures logiques élementaires.Classifications et sériations.}
}