Argraffiad Saesneg gwreiddiol = Original English edition : Kirkby-in-Furness : Coordination Group Publications, 1999.
Yn cynnwys mynegai = Includes index.
Addasiad Cymraeg gan = Welsh adaptation by : Carroll Hughes.
Gwyddoniaeth : cyfnod allweddol dau : y llyfr adolygu. ISBN 1856445801. Published by Y Ganolfan Astudiaethau Addysg in 2001. Publication and catalogue information, links to buy online and reader comments.