Arg. Saesneg gwreiddiol = Original English ed.: Cambridge: Cambridge University Press, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Glenys M. Roberts.
SMP 11-16. Llyfr A7 by Glenys M. Roberts. ISBN 1860853110. Published by Uned Iaith Genedlaethol Cymru CBAC mewn cydweithrediad â Gwasg Prifysgol Caergrawnt in 1998. Publication and catalogue information, links to buy online and reader comments.