Argraffiad Saesneg gwreiddiol = Original English edition : London : A & C Black Publishers, 2001.
Addasiad Cymraeg gan = Welsh adaptation by : Gwawr Maelor.
Ysgol i selsig by Michaela Morgan. ISBN 9781843235484. Published by Gwasg Gomer in 2006. Publication and catalogue information, links to buy online and reader comments.