Addasiad Cymraeg gan = Welsh adaptation by : Elin Meek.
Argraffiad Saesneg gwreiddiol = Original English ediiton : 2003.
Y ffyliaid : a pethau ffiaidd eraill by Daniel Morden. ISBN 1843232936. Published by Gwasg Gomer in 2003. Publication and catalogue information, links to buy online and reader comments.