Trin data.
Glasspoole, Helen.
Jones, Lynwen Rees.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : CAA,
c2010.
Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2009.
"Adnoddau addysgu Mathemateg y gellir eu haddasu, caniateir llungopïo" - ar y clawr = on cover.
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