OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Dafydd ap Gwilym a Dyfed by D. J. Bowen. ISBN 0863832431. Published by Gwasg Gomer ar ran Eisteddfod Genedlaethol Abergwaun a'r Fro in 1986. Publication and catalogue information, links to buy online and reader comments.
