Addasiad Cymraeg gan = Welsh adaptation by : Gwynne Williams.
Argraffiad Saesneg gwreiddiol = Original English edition : London : Walker Books, 2002.
Ydy buwch yn dweud bww? by Judy Hindley. ISBN 1855965712. Published by Dref Wen in 2003. Publication and catalogue information, links to buy online and reader comments.