Flavell, J. H. (1985). Cognitive development (2nd.ed.). Prentice - Hall.
Lua i Stíl Chicago (17ú heag.)Flavell, John H. Cognitive Development. 2nd.ed. New Jersey: Prentice - Hall, 1985.
Lua MLA (9ú heag.)Flavell, John H. Cognitive Development. 2nd.ed. Prentice - Hall, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.