Argraffiad Saesneg gwreiddiol = Original English edition: London : Walker Books, 2001.
Addasiad Cymraeg gan = Welsh adaptation by: Dylan Williams.
Sws nos da, Sam by Amy Hest. ISBN 1902416481. Published by Cymdeithas Lyfrau Ceredigion in 2001. Publication and catalogue information, links to buy online and reader comments.