University of London. Chelsea College. the CSMS Mathematics Team & Hart, K. M. (1981). Children's understanding of mathematics: 11-16. John Murray.
Chicago-viite (17. p.)University of London. Chelsea College. the CSMS Mathematics Team ja Kathleen M. Hart. Children's Understanding of Mathematics: 11-16. London: John Murray, 1981.
MLA-viite (9. p.)University of London. Chelsea College. the CSMS Mathematics Team ja Kathleen M. Hart. Children's Understanding of Mathematics: 11-16. John Murray, 1981.
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