Argraffiad Saesneg gwreiddiol = Original English edition : Cambridge : Cambridge University Press, 1996.
Addasiad Cymraeg gan = Welsh adaptation by : Cymen Cyf.
Mathemateg pen. Llyfr cychwynnol by Anita Straker. ISBN 1860854281. Published by Uned Iaith Genedlaethol Cymru CBAC in 1999. Publication and catalogue information, links to buy online and reader comments.