Arg. Saesneg gwreiddiol = Original English ed.: London: C.S.S.M., 1950.
Addasiad Cymraeg gan = Welsh adaptation by: Iola Thomas.
Trysorau'r eira by Patricia Mary St. John. ISBN 1850491526. Published by Gwasg Bryntirion in 1998. Publication and catalogue information, links to buy online and reader comments.