Includes index.
Argraffiad Saesneg gwreiddiol = Original English edition: Oxford: Oxford University Press, 2000.
Addasiad Cymraeg gan = Welsh adaptation by: Lynwen Rees Jones.
Bioleg uwch by Michael Kent. ISBN 9781856448987. Published by Canolfan Astudiaethau Addysg in 2005. Publication and catalogue information, links to buy online and reader comments.