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Wiliam, Dylan and Lester, F K (2008) On the Purpose of Mathematics Education Research: Making Productive Contributions to Policy and Practice. In: Handbook of International Research in Mathematics Education. Routledge, New York, pp. 32-48. ISBN 978-0-8058-5876-1
Lester, F K and Wiliam, Dylan (2002) On The Purpose of Mathematics Education Research: Making Productive Contributions to Policy and Practice. In: Handbook of International Research in Mathematics Education. Lawrence Erlbaum Associates, Mahwah, New Jersey, pp. 489-506. ISBN 978-0805833713
Lester, F K and Wiliam, Dylan (2000) The Evidential Basis for Knowledge Claims in Mathematics Education Research. Journal for Research in Mathematics Education, 31 (2). pp. 132-137.