Arg gwreiddiol = Originally published: 1988.
Arg Saesneg gwreiddiol = Original English ed: London: Bodley Head, 1982; Fontana Picture Lions, 1984.
Traed Alffi by Shirley Hughes. ISBN 0948930152. Published by Cymdeithas Lyfrau Ceredigion. Publication and catalogue information, links to buy online and reader comments.