Arg. Saesneg gwreiddiol = Original English ed.: Huddersfield: Schofield & Sims Ltd, 1976.
Teitl clawr = Cover title.
Rhifyddeg pen. Llyfr rhagarweiniol. ISBN 0721724833. Published by Schofield & Sims in 1998. Publication and catalogue information, links to buy online and reader comments.