Gwledd y bwystfilod /
Biro, Val,1921-2014.
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: Dylan Williams
Welsh language