Arg. Saesneg gwreiddiol = Original English ed.: Llundain: A & C Black (Publishers), 1998.
Addasiad Cymraeg gan = Welsh adaptation by: Siân Eleri.
Symud y goliau by Rob Childs. ISBN 1859027709. Published by Gwasg Gomer in 1999. Publication and catalogue information, links to buy online and reader comments.