University of London. Chelsea College. the CSMS Mathematics Team & Hart, K. M. (1981). Children's understanding of mathematics: 11-16. John Murray.
Lua i Stíl Chicago (17ú heag.)University of London. Chelsea College. the CSMS Mathematics Team agus Kathleen M. Hart. Children's Understanding of Mathematics: 11-16. London: John Murray, 1981.
Lua MLA (9ú heag.)University of London. Chelsea College. the CSMS Mathematics Team agus Kathleen M. Hart. Children's Understanding of Mathematics: 11-16. John Murray, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.