Arg Saesneg gwreiddiol = Original English ed: E. J. Arnold, 1982.
Addasiad Cymraeg = Welsh adaptation: Cyngor Cwricwlwm Cymru.
Teitl clawr = Cover title.
Ar goll by Joy Cowley. ISBN 017400155X. Published by Nelson in 1990. Publication and catalogue information, links to buy online and reader comments.