APA (7th ed.) Citation

Piaget, J., Inhelder, B., & Weaver, H. (1966). The psychology of the child. Routledge & Kegan Paul.

Chicago Style (17th ed.) Citation

Piaget, Jean, Bärbel Inhelder, and Helen Weaver. The Psychology of the Child. London: Routledge & Kegan Paul, 1966.

MLA (8th ed.) Citation

Piaget, Jean, et al. The Psychology of the Child. Routledge & Kegan Paul, 1966.