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 ; New York: Routledge, 1994.
Cita MLA (9th ed.)
Clemson, David, i Wendy Clemson. Mathematics in the Early Years. Routledge, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.