SMP 11-16 : Llyfr A9 /
Roberts, Glenys M.(Glenys Mair)
National Language Unit of Wales.
Welsh Joint Education Committee.
Caerdydd : Uned Iaith Genedlaethol Cymru, CBAC,
1999.
Arg. Saesneg gwreiddiol = Original English ed.: Cambridge University Press, 1999.
Mathematics