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Society for Research on Child Development.
Inhelder, B. & Piaget, J. (1958). The growth of logical thinking from childhood to adolescence: An essay on the growth of formal operational structures. New York: Basic Books.
Matthews, G. (1998). The philosophy of childhood. Cambridge, MA: Harvard University Press.
Piaget, J. (1952). The origins of intelligence in children. New York: International Universities Press.
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A large portion of the text in this chapter is taken from Chapter 3 of the open access text Educational Psychology, 3rd Edition, 2011 by Kelvin Seiffert and Rosemary Sutton. (Minor modifications to words and phrases were made as needed to fit the current context.)