Arg. Saesneg gwreiddiol = Original English ed.: London: HarperCollins Publishers Ltd, 1998.
Addasiad Cymraeg gan = Welsh adaptation by: Gwynne Williams.
Ch-chwyrnu! by Michael Rosen. ISBN 1855963426. Published by Gwasg y Dref Wen in 1999. Publication and catalogue information, links to buy online and reader comments.