APA (7th ed.) Citation

Piaget, J., Inhelder, B., & Weaver, H. (1969). The psychology of the child. Basic Books, Inc.

Chicago Style (17th ed.) Citation

Piaget, Jean, Barbel Inhelder, and Helen Weaver. The Psychology of the Child. New York: Basic Books, Inc, 1969.

MLA (9th ed.) Citation

Piaget, Jean, et al. The Psychology of the Child. Basic Books, Inc, 1969.