Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2008.
"Adnoddau addysgu Mathemateg y gellir eu haddasu, caniateir llungopïo" - ar y clawr = on cover.
Cyfrif a deall rhifau. Blwyddyn 4 by Hilary Koll. ISBN 9781845213794. Published by CAA in 2010. Publication and catalogue information, links to buy online and reader comments.