Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Walker Books, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Gwynne Williams.
Ble mae tedi? by Jez Alborough. ISBN 1855963566. Published by Gwasg y Dref Wen in 1998. Publication and catalogue information, links to buy online and reader comments.