References
- Gruber , H.E. and Vonèche , J.J. , eds. 1995 . The essential Piaget , 2nd ed. , Northvale , NJ : Jason Oronson .
- Kohler , R. 2008 . Jean Piaget , London : Continuum International Publishing Group .
- Perret-Clermont , A.N. and Barrelet , J.M. , eds. 2008 . Jean Piaget and Neuchâtel: The learner and the scholar , Hove : Psychology Press .