Argraffiad Saesneg gwreiddiol = Original English edition : London : Methuen Children's Books, 1983.
Addasiad Cymraeg gan = Welsh adaptation by : Elwyn Ashford Jones.
Olwynion gwyllt by Michael Hardcastle. ISBN 1859028128. Published by Gwasg Gomer in 2000. Publication and catalogue information, links to buy online and reader comments.