Arg. Saesneg gwreiddiol = Original English ed.: Oxford: Heinemann Publishers, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Marian Beech Hughes.
Dianc o Gastell Sarca by Alan C. McLean. ISBN 1856444104. Published by Y Ganolfan Astudiaethau Addysg in 1999. Publication and catalogue information, links to buy online and reader comments.