Cer i'w nôl e, Harri Parri! /
Lavelle, Sheila.
Ireland, John.
Rogers, Eleri.
National Language Unit of Wales.
Caerdydd : Uned Iaith Genedlaethol Cymru CBAC,
1996.
Arg. Saesneg gwreiddiol = Original English ed.: Harlow : Longman Group, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Eleri Rogers.
Welsh language