Arg Almaeneg gwreiddiol = Original German ed: Zürich: Nord-Süd Verlag, 1990. - Addasiad Saesneg = English adaptation: Zürich; Nord-Süd Verlag, 1990.
Addasiad Cymraeg gan = Welsh adaptation by: Juli Paschalis.
Ffrind i'r arth bach gwyn by Hans De Beer. ISBN 0861740238. Published by Gwasg Addysgol Drake. Publication and catalogue information, links to buy online and reader comments.