Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Oxford University Press, 1999.
Addasiad Cymraeg gan = Welsh adaptation by : Juli Paschalis.
Chwilio am y si-so aur by Karen Wallace. ISBN 0861745167. Published by Gwasg Addysgol Drake in 2002. Publication and catalogue information, links to buy online and reader comments.