Argraffiad Saesneg gwreiddiol = Original English edition : London : HarperCollins, 1998.
Addasiad Cymraeg gan = Welsh adaptation by : Siân Lewis.
Y clwb cysgu cŵl ar garlam by Fiona Cummings. ISBN 1843231654. Published by Gomer in 2002. Publication and catalogue information, links to buy online and reader comments.