Arg. Saesneg gwreiddiol = Original English ed.: [London]: Doubleday, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Aled P. Jones.
Dim ond ti all achub y ddynoliaeth by Terry Pratchett. ISBN 0860741443. Published by Gwasg Gwynedd in 1998. Publication and catalogue information, links to buy online and reader comments.