@book{28919,
	author = {Ginsburg, Herbert. and Brandt, Sylvia Opper},
	title = {Piaget's theory of intellectual development},
	publisher = {Prentice-Hall},
	year = {[1969]},
	series = {The Prentice-Hall series in developmental psychology},
	address = {Englewood Cliffs, N.J.}
}