Arg. Saesneg gwreiddiol = Original English ed.: [Llundain]; Andersen Press, [1994?].
Addasiad Cymraeg gan = Welsh adaptation by: Hedd a Non ap Emlyn.
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Elfed ac Eifion by David McKee. ISBN 1855963795. Published by Gwasg y Dref Wen in 1999. Publication and catalogue information, links to buy online and reader comments.
