Argraffiad Saesneg gwreiddiol = Original English edition: London : Walker Books, 1997.
Trosiad Cymraeg gan = Welsh adaptation by: Hedd and Non ap Emlyn.
Ffrindiau by Kim Lewis. ISBN 185596449X. Published by Gwasg y Dref Wen in 2000. Publication and catalogue information, links to buy online and reader comments.