Rhaglen gyfoethogi mathemateg.
Ifan, Delyth.
National Language Unit of Wales.
University of Exeter.Centre for Innovation in Mathematics Teaching.
Caerdydd : Uned Iaith Genedlaethol Cymru CBAC,
1999.
Addasiad Cymraeg gan = Welsh adaptation by: Delyth Ifan.
Arg. Saesneg gwreiddiol = Original English ed.: Exeter: CIMT, University of Exeter, [1992?]
Mathematics