APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Clemson, David, and Wendy Clemson. Mathematics in the Early Years. London ; New York: Routledge, 1994.

MLA (9th ed.) Citation

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