Arg Saesneg gwreiddiol = Original English ed: E. J. Arnold, 1983.
Addasiad Cymraeg = Welsh adaptation: Cyngor Cwricwlwm Cymru.
Teitl clawr = Cover title.
Snichod by Joy Cowley. ISBN 0174001495. Published by Nelson in 1990. Publication and catalogue information, links to buy online and reader comments.