Arg Saesneg gwreiddiol = Original English ed: Leeds: Edward Arnold, 1983.
Addasiad Cymraeg = Welsh adaptation: Cyngor Cwricwlwm Cymru.
Teitl clawr = Cover title.
Beth wela i? by Joy Cowley. ISBN 0174001525. Published by Nelson in 1990. Publication and catalogue information, links to buy online and reader comments.