Addasiad Cymraeg gan = Welsh adaptation by : Dylan Williams.
Argraffiad Saesneg gwreiddiol = Original English edition : London : Walker Books, 2003.
Y gath a aeth yn rhy bell by Allan Ahlberg. ISBN 1902416953. Published by Cymdeithas Lyfrau Ceredigion in 2004. Publication and catalogue information, links to buy online and reader comments.