APA (7e ed.) Bronvermelding

Piaget, J., Gruber, H. E., & Voneche, J. J. (1977). The essential Piaget. Basic Books.

Chicago (17e ed.) Bronvermelding

Piaget, Jean, Howard E. Gruber, en J. Jacques Voneche. The Essential Piaget. New York: Basic Books, 1977.

MLA (9e ed.) Bronvermelding

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