Argraffiad Saesneg gwreiddiol = Original English edition : London : Methuen, 1996.
Addasiad Cymraeg gan = Welsh adaptation by : Meinir Wyn Edwards.
Y dylluan oedd yn ofni'r tywyllwch by Jill Tomlinson. ISBN 1859028241. Published by Gwasg Gomer in 2000. Publication and catalogue information, links to buy online and reader comments.