Llyfryddiaeth = Bibliography: p467-469. - Yn cynnwys mynegai = Includes index.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Porthmyn Môn by Emlyn Richards. ISBN 1874786763. Published by Gwasg Pantycelyn in 1998. Publication and catalogue information, links to buy online and reader comments.
