Argraffiad Saesneg gwreiddiol = Original English edition : London : Hodder Children's Books, 2000.
Addasiad Cymraeg gan = Welsh adaptation by : Sian Owen.
Hadau pen i waered a rhai cwestiynau gwyddonol eraill by Brenda Naylor. ISBN 1855966050. Published by Gwasg y Dref Wen in 2003. Publication and catalogue information, links to buy online and reader comments.