APA (7th ed.) Citation

Piaget, J. (1929). The child's conception of the world. Routledge & K. Paul.

Chicago Style (17th ed.) Citation

Piaget, Jean. The Child's Conception of the World. London: Routledge & K. Paul, 1929.

MLA (9th ed.) Citation

Piaget, Jean. The Child's Conception of the World. Routledge & K. Paul, 1929.