Arg. Saesneg gwreiddiol = Original English ed.: Hove: Macdonald Young Books, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Gwynne Williams.
Os wyt ti am fod yn gath by Joyce Dunbar. ISBN 1855963604. Published by Gwasg y Dref Wen in 1998. Publication and catalogue information, links to buy online and reader comments.