KOHLER, R. (2014). Jean Piaget. Bloomsbury Academic.
Lua i Stíl Chicago (17ú heag.)KOHLER, Richard. Jean Piaget. Bloomsbury Academic, 2014.
Lua MLA (9ú heag.)KOHLER, Richard. Jean Piaget. Bloomsbury Academic, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.