Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Lion Publishing, 2002.
Addasiad Saesneg gan = Welsh adaptation by : Delyth Wyn.
Teitl clawr = Cover title.
Nawr rwyt ti'n 4 by Gabriella Buckingham. ISBN 1859944280. Published by Cyhoeddiadau'r Gair in 2002. Publication and catalogue information, links to buy online and reader comments.