Cita APA (7a ed.)

Piaget, J., Gruber, H. E., & Vonèche, J. J. (1977). The essential Piaget. Basic Books, Inc., Publishers.

Cita Chicago Style (17a ed.)

Piaget, Jean, Howard E. Gruber, y J. Jacques Vonèche. The Essential Piaget. New York: Basic Books, Inc., Publishers, 1977.

Cita MLA (9a ed.)

Piaget, Jean, et al. The Essential Piaget. Basic Books, Inc., Publishers, 1977.