Davidson Films & Piaget, J. (1976). Piaget's developmental theory: Formal reasoning patterns [videorecording]. Davidson Films.
Cita Chicago (17th ed.)Davidson Films i Jean Piaget. Piaget's Developmental Theory: Formal Reasoning Patterns [videorecording]. [Davis, Calif.]: Davidson Films, 1976.
Cita MLA (9th ed.)Davidson Films i Jean Piaget. Piaget's Developmental Theory: Formal Reasoning Patterns [videorecording]. Davidson Films, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.