Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Two-Can Publishing, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Cymen Cyf.
Cyhoeddwyd dan nawdd Cynllun Adnoddau Cyd-bwyllgor Addysg Cymru = Published under the auspices of the Welsh Joint Education Committee Resources Project.
Trydan by Wendy Baker. ISBN 1859025870. Published by Gwasg Gomer in 1997. Publication and catalogue information, links to buy online and reader comments.