Argraffiad Saesneg gwreiddiol = Original English edition: London : HarperCollins, 1998.
Addasiad Cymraeg gan = Welsh adaptation by: Siân Lewis.
Y clwb cysgu cŵl ar nos Wener 13 by Louis Catt. ISBN 1859029108. Published by Gwasg Gomer in 2000. Publication and catalogue information, links to buy online and reader comments.