Arg. Saesneg gwreiddiol = Original English ed.: Harlow: Longman, 1994.
Wedi ei briodoli yn anghywir i Sheila Lavelle ar y dudalen deitl = Mistakenly attributed to Sheila Lavelle on the title page.
Byrti a'i Ewyrth Basil by Mark Ezra. ISBN 1860853242. Published by Uned Iaith Genedlaethol Cymru in 1998. Publication and catalogue information, links to buy online and reader comments.