Piaget, Jean. The child's conception of movement and speed / Jean Piaget ; translated from the French by G. E. T. Holloway and M. J. Mackenzie - New York Ballantine Books c1971. - 341 p. ISBN: 345-02372-2-165 Subjects--Topical Terms: Child psychology.Motion perception (Vision). Dewey Class. No.: 152.1425 P57