APA (7th ed.) Zitazioa
Piaget, J. (1999). The child's conception of physical causality. Routledge.
Chicago Style (17th ed.) Zitazioa
Piaget, Jean. The Child's Conception of Physical Causality. London: Routledge, 1999.
MLA (9th ed.) Zitazioa
Piaget, Jean. The Child's Conception of Physical Causality. Routledge, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.