@book{29633,
	author = {Piaget, Jean, and Inhelder, Bärbel.},
	title = {The child's conception of space /},
	publisher = {Routledge & Kegan Paul,},
	year = {1967.},
	series = {International library of psychology, philosophy and scientific method},
	address = {London :},
	note = {Translation of La représentation de l'espace chez l'enfant.}
}