Arg. Saesneg gwreiddiol = Original English ed.:London:Hodder & Stoughton,1990.
Tasgau TGAU : cwestiynau strwythuredig ar gyfer mathemateg TGAU by David Whetton. ISBN 185644161X. Published by Canolfan Astudiaethau Addysg in 1993. Publication and catalogue information, links to buy online and reader comments.