Clemson, D., & Clemson, W. (1994). Mathematics in the early years. Routledge.
Lua i Stíl Chicago (17ú heag.)Clemson, David, agus Wendy Clemson. Mathematics in the Early Years. London: Routledge, 1994.
Lua MLA (9ú heag.)Clemson, David, agus Wendy Clemson. Mathematics in the Early Years. Routledge, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.