Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Oxford University Press, 1999.
Addasiad Cymraeg gan = Welsh adaptation by : Juli Paschalis.
Y peiriant bychanu bwlis by Paul Shipton. ISBN 0861745191. Published by Gwasg Addysgol Drake in 2002. Publication and catalogue information, links to buy online and reader comments.