Argraffiad Saesneg gwreiddiol = Original English edition : London : Macmillan Children's Books, 1996.
Addasiad Cymraeg gan = Welsh adaptation by : Gwenllian Dafydd.
Taro'r allwedd by Michael Coleman. ISBN 1859028144. Published by Gwasg Gomer in 2000. Publication and catalogue information, links to buy online and reader comments.