Arg. Saesneg gwreiddiol = Original English ed.: Oxford: Heinemann English Language Teaching, 1991.
Addasiad Cymraeg gan = Welsh adaptation by: Marian Beech Hughes.
Kate yn dial by Philip Prowse. ISBN 1856444090. Published by Y Ganolfan Astudiaethau Addysg in 1999. Publication and catalogue information, links to buy online and reader comments.