Arg. Saesneg gwreiddiol = Original English ed.: Cambridge: Cambridge University Press, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Trosol Cyf.
Mathemateg pen : ar gyfer oedrannau 7 i 9 : llyfr athrawon by Anita Straker. ISBN 186085284X. Published by Uned Iaith Genedlaethol Cymru in 1998. Publication and catalogue information, links to buy online and reader comments.