Arg. Saesneg gwreiddiol = Original English ed.: Harlow: Longman Group, 1994.
Addasiad Cymraeg gan = Welsh adaptation by: Eleri Rogers.
Gwyliau DJ by Stan Cullimore. ISBN 186085317X. Published by Uned Iaith Genedlaethol Cymru in 1998. Publication and catalogue information, links to buy online and reader comments.