Arg. Saesneg gwreiddiol = Original English ed.: 1952.
Cyfieithiad o'r 4ydd arg. Saesneg a gyhoeddwyd = Translation of the 4th English ed. which was published: 1996.
Geiriadur cerddoriaeth Rhydychen by Michael Kennedy. ISBN 1897664516. Published by Curiad in 1998. Publication and catalogue information, links to buy online and reader comments.