Is-deitl y clawr = Cover subtitle: Rhestr o eiriau a gamsillefir yn gyson, ynghyd ag awgrymiadau ar gyfer ysgrifennu Cymraeg cywir.
Canllawiau iaith a chymorth sillafu by J. Elwyn Hughes. ISBN 1859025714. Published by Gomer in 2004. Publication and catalogue information, links to buy online and reader comments.