Piaget Jean. (1967). Six Psychological studies (ed.). Vintage Books.
Lua i Stíl Chicago (17ú heag.)Piaget Jean. Six Psychological Studies. ed. New York: Vintage Books, 1967.
Lua MLA (9ú heag.)Piaget Jean. Six Psychological Studies. ed. Vintage Books, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.