APA (7th ed.) Zitazioa
Furth, H. G. Piaget for Teachers. Prentice-Hall.
Chicago Style (17th ed.) Zitazioa
Furth, Hans G. Piaget for Teachers. Englewood Cliffs, EUA: Prentice-Hall.
MLA (9th ed.) Zitazioa
Furth, Hans G. Piaget for Teachers. Prentice-Hall.
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