Sigel, I. E., & Cocking, R. R. (1977). Cognitive development from childhood to adolescence: A constructivist perspective. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Sigel, Irving E., agus Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. New York: Holt, Rinehart and Winston, 1977.
Lua MLA (8ú heag.)Sigel, Irving E., agus Rodney R. Cocking. Cognitive Development from Childhood to Adolescence: A Constructivist Perspective. Holt, Rinehart and Winston, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.