Cita APA (7th ed.)

Clemson, D., & Clemson, W. (1994). Mathematics in the early years. Routledge.

Cita Chicago (17th ed.)

Clemson, David, i Wendy Clemson. Mathematics in the Early Years. London: Routledge, 1994.

Cita MLA (9th ed.)

Clemson, David, i Wendy Clemson. Mathematics in the Early Years. Routledge, 1994.