Argraffiad Saesneg gwreiddiol = Original English edition : London : Orchard Books, 2004.
Addasiad Cymraeg gan = Welsh adaptation by : Anne K. Till.
Y griffin a Gwilym ap Huw by Michael Lawrence. ISBN 9781845120474. Published by Cymdeithas Lyfrau Ceredigion Gyf. in 2006. Publication and catalogue information, links to buy online and reader comments.