Argraffiad Saesneg gwreiddiol = Original English edition : London : Orion Children's Books, 1994.
Addasiad Cymraeg gan = Welsh adaptation by : Siân Lewis.
Henri Helynt by Francesca Simon. ISBN 1845211227. Published by Y Ganolfan Astudiaethau Addysg in 2006. Publication and catalogue information, links to buy online and reader comments.