Arg. Saesneg gwreiddiol = Original English ed.: Oxford: Lion, 1992.
Addasiad Cymraeg gan = Welsh adaptation by: Nansi Pritchard.
A gwrandawodd y môr - by Pauline Fisk. ISBN 0863815324. Published by Gwasg Carreg Gwalch in 1999. Publication and catalogue information, links to buy online and reader comments.