Cita APA (7th ed.)

Piaget, J., & Cook, M. (1977). The origin of intelligence in the child (Second edition.). Penguin Books.

Cita Chicago (17th ed.)

Piaget, Jean, i Margaret Cook. The Origin of Intelligence in the Child. Second edition. Harmondsworth: Penguin Books, 1977.

Cita MLA (9th ed.)

Piaget, Jean, i Margaret Cook. The Origin of Intelligence in the Child. Second edition. Penguin Books, 1977.