Allwedd mathemateg TGAU :
Baker, David,1961-
University of Wales, Aberystwyth.Centre for Educational Studies.
Argraffiad Saesneg gwreiddiol = Original English edition: Cheltenham : Stanley Thornes, 1998.
Cyfieithwyd i'r Gymraeg gan = Translated into Welsh by: Ffion Kervegant.
Mathematics