Dim ond ti all achub y ddynoliaeth /
Pratchett, Terry.
Jones, Aled P.
Caernarfon : Gwasg Gwynedd,
1998.
Arg. Saesneg gwreiddiol = Original English ed.: [London]: Doubleday, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Aled P. Jones.
Life on other planets