APA (7th ed.) Citation

Piaget, J., Inhelder, B., & Szeminska, A. (1960). The child's conception of geometry. Kegan Paul.

Chicago Style (17th ed.) Citation

Piaget, Jean, Barbel Inhelder, and Alina Szeminska. The Child's Conception of Geometry. London: Kegan Paul, 1960.

MLA (9th ed.) Citation

Piaget, Jean, et al. The Child's Conception of Geometry. Kegan Paul, 1960.