Cyhoeddiad Saesneg gwreiddiol = Original English edition: London: Julia MacRae, 1992.
Cyhoeddwyd dan nawdd Cynllun Llyfrau Darllen Cyd-bwyllgor Addysg Cymru = Published under the auspices of the Welsh Joint Education Committee Reading Books Project.
Sw by Anthony Browne. ISBN 1855961652. Published by Dref Wen in 1995. Publication and catalogue information, links to buy online and reader comments.