Arg Saesneg gwreiddiol = Original English ed: Heinemann Educational, 1990.
Addasiad Cymraeg gan = Welsh adaptation by: Y Ganolfan Astudiaethau Iaith.
Dylunio a thechnoleg mewn proses : iach a heini. ISBN 1871913330. Published by Canolfan Astudiaethau Iaith in 1992. Publication and catalogue information, links to buy online and reader comments.