Arg Saesneg gwreiddiol = Original English ed: Oxford: Oxford University Press, 1989.
Addasiad Cymraeg = Welsh adaptation: Mel Williams.
Cyfieithiad Cymraeg o = Welsh translation of: Sliding and rolling.
Rholio a llithro by Terry J. Jennings. ISBN 1856441652. Published by Canolfan Astudiaethau Addysg in 1992. Publication and catalogue information, links to buy online and reader comments.