Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Nelson Thornes, 2003.
Addasiad Cymraeg gan = Welsh adaptation by : Elin Meek.
Y cynrhonyn by Paul Jennings. ISBN 9781843233961. Published by Gwasg Gomer in 2005. Publication and catalogue information, links to buy online and reader comments.