Argraffiad Saesneg gwreiddiol = Original English edition: Llandysul : Pont, 2001.
Addasiad ar gyfer dysgwyr gan = Adapted for Welsh learners by: Catrin Griffiths.
Mi welais long yn hwylio : a simplified version of the story for Welsh learners by Siân Lewis. ISBN 1859029124. Published by Gwasg Gomer in 2001. Publication and catalogue information, links to buy online and reader comments.