Pwdin /
Morgan, Michaela.
Hussey, Lorna.
Huws, Emily.
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: Emily Huws