Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2009.
'Adnoddau addysgu Mathemateg y gellir eu haddasu, caniateir llungopïo' - clawr = cover.
Trin data. Blwyddyn 6 by Helen Glasspoole. ISBN 9781845214586. Published by Canolfan Astudiaethau Addysg in 2011. Publication and catalogue information, links to buy online and reader comments.