Arg. Saesneg gwreiddiol = Original English ed: Cambridge: Cambridge University Press, 1989.
Mathemateg cynradd Caergrawnt by R. A. Edwards. ISBN 1859020046. Published by Cyhoeddwyd gan Wasg Gomer mewn cydweithrediad â Gwasg Prifysgol Caergrawnt in 1994. Publication and catalogue information, links to buy online and reader comments.