Cita APA (7th ed.)
Piaget, J., & Elkind, D. (1964). Sic psychological studies.
Cita Chicago (17th ed.)
Piaget, Jean, i David Elkind. Sic Psychological Studies. 1964.
Cita MLA (9th ed.)
Piaget, Jean, i David Elkind. Sic Psychological Studies. 1964.
Atenció: Aquestes cites poden no estar 100% correctes.