Cita APA (7th ed.)

Piaget, J. (1960). The child's conception of geometry. Basic books.

Cita Chicago (17th ed.)

Piaget, Jean. The Child's Conception of Geometry. New York: Basic books, 1960.

Cita MLA (9th ed.)

Piaget, Jean. The Child's Conception of Geometry. Basic books, 1960.