Argraffiad Saesneg gwreiddiol = Original English edition : London : Mammoth, 2001.
Addasiad Cymraeg gan = Welsh adaptation by : Catrin Hughes.
Gruffudd a'r crafanc cyrliog by Jan Fearnley. ISBN 1855966212. Published by Gwasg y Dref Wen in 2004. Publication and catalogue information, links to buy online and reader comments.