Argraffiad Saesneg gwreiddiol = Original English edition : Cardiff: Gwasg y Dref Wen, 1999.
Addasiad Cymraeg = Welsh adaptation : Ken Owen.
O'r dechrau i'r diwedd : canllaw athrawon by Trevor Guy. ISBN 1855962934. Published by Gwasg y Dref Wen in 1999. Publication and catalogue information, links to buy online and reader comments.