Argraffiad Saesneg gwreiddiol = Original English edition : London : Puffin Books, 2006.
Addasiad Cymraeg gan = Welsh adaptation by : Sioned Lleinau.
Owain yn mynd i'r ysgol by Ian Whybrow. ISBN 9781843238539. Published by Gwasg Gomer in 2007. Publication and catalogue information, links to buy online and reader comments.