Argraffiad Saesneg gwreiddiol = Original English edition : Cheltenham : Stanley Thornes, 1998.
Allwedd daearyddiaeth : cyfnod allweddol 3. Pecyn cyfoethogi ar gyfer disgyblion is eu gallu, 3. ISBN 1856446778. Published by Canolfan Astudiaethau Addysg in 2004. Publication and catalogue information, links to buy online and reader comments.