@book{773,
	author = {Siegler, Robert S. and Carnegie Symposium on Cognition},
	title = {Children's thinking :},
	publisher = {L. Erlbaum Associates ;},
	year = {1978.},
	address = {Hillsdale, N.J. :},
	note = {An outgrowth of the 13th annual Carnegie Cognition Symposium, held in May 1977.}
}