Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Orchard Books, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Luned Whelan.
Ysgol y bleiddiaid by Jonathan Allen. ISBN 085284235X. Published by Hughes a'i Fab in 1999. Publication and catalogue information, links to buy online and reader comments.