Argraffiad Saesneg gwreiddiol = Original English edition : London : BBC Worldwide, 1999.
Addasiad Cymraeg gan = Welsh adaptation by : Hedd a Non ap Emlyn.
Trwmped Bob by Diane Redmond. ISBN 1855966948. Published by Gwasg y Dref Wen in 2005. Publication and catalogue information, links to buy online and reader comments.