Argraffiad Saesneg gwreiddiol = Original English edition : London : David and Charles Children's Books, 2001.
Addasiad Cymraeg gan = Welsh adaptation by : Dylan Williams.
Weithiau rwy'n - by Vicki Churchill. ISBN 1902416767. Published by Cymdeithas Lyfrau Ceredigion in 2002. Publication and catalogue information, links to buy online and reader comments.