Arg. Saesneg gwreiddiol = Original English ed.: London: Orchard Books, 1996.
Addasiad Cymraeg gan = Welsh adaptation by: Hedd a Non ap Emlyn.
Mr Arth yr arwr by Debi Gliori. ISBN 1855962799. Published by Dref Wen in 1997. Publication and catalogue information, links to buy online and reader comments.