Addasiad Cymraeg gan = Welsh adaptation by : Emily Huws.
Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Oxford University Press, 1996.
Y ffisig ffrwydrol by Alan MacDonald. ISBN 0861745094. Published by Gwasg Addysgol Drake in 2002. Publication and catalogue information, links to buy online and reader comments.