Addasiad Cymraeg gan = Welsh adaptation by : Ffion E. Kervegant.
Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Stanley Thornes, 1999.
Allwedd mathemateg 8. ISBN 1856446689. Published by Y Ganolfan Astudiaethau Addysg in 2002. Publication and catalogue information, links to buy online and reader comments.