Argraffiad Saesneg gwreiddiol = Original English edition : London : Scholastic Children's Books, 2005.
Addasiad Cymraeg gan Hedd a Non ap Emlyn = Welsh adaptation by : Hedd and Non ap Emlyn.
Y pengwin oedd eisiau hedfan by Catherine Vase. ISBN 1855966972. Published by Gwasg y Dref Wen. in 2005. Publication and catalogue information, links to buy online and reader comments.