Testun Cymraeg = Welsh text: Myrddin ap Dafydd [Coloffon = Colophon].
Testun gwreiddiol Saesneg = Original English text: Tony Ross [Coloffon = Colophon].
Heb ddod o hyd i'r teitl gwreiddiol = Original title not traced.
Chwarae yn y castell : llyfr gweithgareddau. ISBN 9781845271077. Published by Gwasg Carreg Gwalch in 2007. Publication and catalogue information, links to buy online and reader comments.