Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Walker Books, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Hywel Nicholas.
Naw hwyaden fechan by Sarah Hayes. ISBN 0952153661. Published by Gwasg Pobl Cymru in 1998. Publication and catalogue information, links to buy online and reader comments.