KOHLER Richard. (2014). Jean Piaget. Bloomsbury Acaqdemic.
Cita Chicago (17th ed.)KOHLER Richard. Jean Piaget. Bloomsbury Acaqdemic, 2014.
Cita MLA (9th ed.)KOHLER Richard. Jean Piaget. Bloomsbury Acaqdemic, 2014.
Atenció: Aquestes cites poden no estar 100% correctes.