Arg. Saesneg gwreiddiol = Original English ed.: London: John Murray, 1989.
Uwchben teitl clawr = At head of cover title: Rhaglen Ddatblygu Addysg Hyblyg.
Grymoedd a meysydd. Published by Uned Iaith Genedlaethol Cymru CBAC in 1996. Publication and catalogue information, links to buy online and reader comments.