Gwendeg /
Fisk, Nicholas,1923-
Jôns, Iola
Llandysul : Gwasg Gomer,
1997.
Arg. Saesneg gwreiddiol = Original English ed.: Llundain: William Heinemann, 1973.
Addasiad Cymraeg gan = Welsh adaptation by: Iola Jôns.
Life on other planets