Arg. Saesneg gwreiddiol = Original English ed.:Cambridge:Cambridge University Press,1989.
On title page: CBAC.
Mathemateg cynradd Caergrawnt = Cambridge primary mathematics. Modwl pedwar. Llyfr 2 by R. A. Edwards. ISBN 086383907X. Published by Cyhoeddwyd gan Wasg Gomer mewn cydweithrediad â Gwasg Prifysgol Caergrawnt in 1993. Publication and catalogue information, links to buy online and reader comments.