Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Walker Books, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Gwynne Williams.
Dyma'r arth! by Jez Alborough. ISBN 1855963183. Published by Dref Wen in 1997. Publication and catalogue information, links to buy online and reader comments.