Argraffiad Saesneg gwreiddiol = Original English edition : London : Usborne Publishing, 1989.
Addasiad Cymraeg gan = Welsh adaptation by : Emily Huws.
Y ddafad ddrwg by Heather Amery. ISBN 9781843237945. Published by Gwasg Gomer in 2007. Publication and catalogue information, links to buy online and reader comments.