Arg. Saesneg gwreiddiol = Original English ed.: Llundain: Picadilly Press, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Hedd a Non ap Emlyn.
Ryan a'i wobr ben-blwydd by Lisa Stubbs. ISBN 1855963272. Published by Gwasg y Dref Wen in 1998. Publication and catalogue information, links to buy online and reader comments.