Arg. Saesneg gwreiddiol = Original English ed. 1995.
Addasiad Cymraeg gan = Welsh adaptation by J. Philip Davies.
Yng nghanol y nos by Robert Cormier. ISBN 1860853935. Published by Uned Iaith Genedlaethol Cymru CBAC in 1999. Publication and catalogue information, links to buy online and reader comments.