APA (7th ed.) Citation

Piaget, J., Gruber, H. E., & Vonèche, J. J. (1995). The essential Piaget. Jason Aronson.

Chicago Style (17th ed.) Citation

Piaget, Jean, Howard E. Gruber, and J. Jacques Vonèche. The Essential Piaget. Northvale, N.J.: Jason Aronson, 1995.

MLA (8th ed.) Citation

Piaget, Jean, et al. The Essential Piaget. Jason Aronson, 1995.

Warning: These citations may not always be 100% accurate.