Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Stanley Thornes, 1995.
Addasiad Cymraeg gan = Welsh adaptation by : Ffion E. Kervegant.
Allwedd mathemateg. 7.2. ISBN 1856444287. Published by Y Ganolfan Astudiaethau Addysg in 2000. Publication and catalogue information, links to buy online and reader comments.