@book{44823,
	author = {Piaget, Jean},
	title = {Estudio sobre la lógica del niño, v. 2: },
	publisher = {Guadalupe,},
	year = {1972.},
	address = {Buenos Aires :},
	edition = {3a. ed.},
	note = {Colaboración de: E. Cartalis, S. Escher, U. Hanhart, L. Lanloser, D. Matthes, S. Perret y M. Roud.}
}