The psychology of the child / [by] Jean Piaget and Barbel Inhelder. Translated from the French by Helen Weaver. Piaget, Jean, Inhelder, Barbel jt. author. Child psychology. BF721 .P4813 136.7 PIP New York : Basic Books, 1969. 1969. 1969 Text xiv, 173 p. ; eng engfre Translation of: La psychologie de l'enfant