Addasiad Cymraeg gan = Welsh adaptation by : Hedd a Non ap Emlyn.
Argraffiad Saesneg gwreiddiol = Original English edition : London : Walker, 2001.
Ifan cyw melyn by Martin Waddell. ISBN 1855965038. Published by Gwasg y Dref Wen in 2001. Publication and catalogue information, links to buy online and reader comments.