Argraffiad Saesneg gwreiddiol = Original English edition : London : Egmont Children's Books Limited, 2003.
Addasiad Cymraeg gan = Welsh adaptation by : Elin Meek.
Siriol Llywelyn a dial y bwgan by David Sutherland. ISBN 1855966786. Published by Gwasg y Dref Wen in 2005. Publication and catalogue information, links to buy online and reader comments.