Arg. Saesneg gwreiddiol = Original English ed.: London: Orchard Books, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Elen Rhys.
Pwtyn Cathwaladr : y gath drymaf yn y byd by Rose Impey. ISBN 0860741494. Published by Gwasg Gwynedd in 1998. Publication and catalogue information, links to buy online and reader comments.