Arg Saesneg gwreiddiol = Original English ed: New York: Grosset & Dunlap, 1990.
Teitl clawr = Cover title.
Testun ar y cloriau = Text on inside covers.
Swyddfa'r post by Joanne Barkan. ISBN 0859537013. Published by Child's Play (International) in 1991. Publication and catalogue information, links to buy online and reader comments.