Sigel, I. E., & Cocking, R. R. (1977). Cognitive development from childhood to adolescence: A constructivist perspective. Holt, Rinehart and Winston.

Sigel, Irving E., and Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. New York: Holt, Rinehart and Winston, 1977.

Sigel, Irving E., and Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. Holt, Rinehart and Winston, 1977.