Arg. Saesneg gwreiddiol = Original English ed.: Oxford: Heinemann English Language Teaching.
Addasiad Cymraeg gan = Welsh adaptation by: Marian Beech Hughes.
Seren o lun by John Escott. ISBN 1856444031. Published by Y Ganolfan Astudiaethau Addysg in 1999. Publication and catalogue information, links to buy online and reader comments.