Addasiad ar gyfer plant a phobl ifanc = An adaptation for children and young people.
Argraffiad cyflawn gwreiddiol = Original complete edition: Llandybie: Llyfrau'r Dryw, 1955.
Siwan by Saunders Lewis. ISBN 1860854117. Published by Uned Iaith Genedlaethol Cymru, CBAC in 2000. Publication and catalogue information, links to buy online and reader comments.