Cyhoddwyd gyntaf yn Saesneg = First published in English: Rhydychen : Rigby, 1999.
Addasiad Cymraeg gan = Welsh adaptation by: Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru.
Ffocws rhifedd 3 : llyfr ffocws dosbarth by Mike Askew. ISBN 0948469781. Published by Gwasg Taf in 2001. Publication and catalogue information, links to buy online and reader comments.