Argraffiad Saesneg gwreiddiol = Original English edition : London : HarperCollins, 1998.
Argraffiad Cymraeg gwreiddiol = Original Welsh edition : 1999.
Addasiad Cymraeg gan = Welsh adaptation by : Gwynne Williams.
Ch-chwyrnu! by Michael Rosen. ISBN 9781855966031. Published by Dref Wen in 2003. Publication and catalogue information, links to buy online and reader comments.