Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Lion, 1997.
Addasiad Cymraeg gan = Welsh adaptation by : Delyth Wyn.
Y saer addfwyn by Lois Rock. ISBN 1859941249. Published by Cyhoeddiadau'r Gair in 1998. Publication and catalogue information, links to buy online and reader comments.