Argraffiad Saesneg gwreiddiol = Original English edition : London : Penguin Books, 2004.
Addasiad Cymraeg gan = Welsh adaptation by : Sioned Lleinau.
Hardback book with cut out pages showing clock with movable hands.
Owain a'r cloc by Ian Whybrow. ISBN 1843233665. Published by Gwasg Gomer in 2004. Publication and catalogue information, links to buy online and reader comments.