Halford, Graeme S. Halford, Graeme S.
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Children's Understanding: The Development of Mental Models
ISBN 9780898599701
Hardcover, Psychology Press, 1993
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Mathematics Education
ISBN 9780805814576
Hardcover, Routledge, 1995
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Children's Understanding: The Development of Mental Models
ISBN 9780805812336
Paperback, Psychology Press, 1993
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Mathematics Education: Models and Processes
ISBN 9780805814583
Paperback, Routledge, 1995
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