APA (7th ed.) Zitazioa
Piaget Jean. (1969). The child's conception of physical causality (ed.). Littlefield.
Chicago Style (17th ed.) Zitazioa
Piaget Jean. The Child's Conception of Physical Causality. ed. New Jersey: Littlefield, 1969.
MLA (9th ed.) Zitazioa
Piaget Jean. The Child's Conception of Physical Causality. ed. Littlefield, 1969.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.