Arg. Saesneg gwreiddiol = Original English ed: Hove: Wayland, 1987.
Yn cynnwys mynegai = Includes index.
Pererindod by Jon Mayled. ISBN 1853570745. Published by Canolfan Genedlaethol Addysg Grefyddol in 1994. Publication and catalogue information, links to buy online and reader comments.