Arg. Saesneg gwreiddiol = English ed.: New ed. Llundain: Macmillan Children's, 1996.
Addasiad Cymraeg gan = Welsh adaptation by: Rhian Pierce Jones.
Doctor Swyn by Terence Blacker. ISBN 1859026141. Published by Gwasg Gomer in 1999. Publication and catalogue information, links to buy online and reader comments.