Arg. Saesneg gwreiddiol = Original English ed.: London: Longman, 1990.
Addasiad Cymraeg gan = Welsh adaptation by: Euros Siôn Ifan.
Teitl clawr = Cover title.
Simon a'r ysbïwr by Elizabeth Laird. ISBN 1855962683. Published by Dref Wen in 1996. Publication and catalogue information, links to buy online and reader comments.