Sigel, I. E., & Cocking, R. R. (1977). Cognitive development from childhood to adolescence: A constructivist perspective. Holt, Rinehart and Winston.
Chicago-referens (17:e uppl.)Sigel, Irving E., och Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. New York: Holt, Rinehart and Winston, 1977.
MLA-referens (8:e uppl.)Sigel, Irving E., och Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. Holt, Rinehart and Winston, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.