Arg. Saesneg gwreiddiol = Original English ed.: Economics. - Publ. by Pearson Education Limited. [4th ed.].
Yn cynnwys mynegai = Includes index.
Economeg safon uwch. Cyfrol 1 by A. G. Anderton. ISBN 1905255659. Published by @ebol in 2007. Publication and catalogue information, links to buy online and reader comments.