Testun ar y cloriau mewnol = Text on inside covers.
Geiriadur Almaeneg-Cymraeg, Cymraeg-Almaeneg = Wörterbuch Deutsch-Walisisch, Walisisch-Deutsch. ISBN 1856444171. Published by Y Ganolfan Astudiaethau Addysg in 1999. Publication and catalogue information, links to buy online and reader comments.