APA (7th ed.) Citation

Piaget, J., & Inhelder, B. (1969). The psychology of the child. Basic books.

Chicago Style (17th ed.) Citation

Piaget, Jean, and Barbel Inhelder. The Psychology of the Child. New York: Basic books, 1969.

MLA (9th ed.) Citation

Piaget, Jean, and Barbel Inhelder. The Psychology of the Child. Basic books, 1969.