Addasiad Cymraeg gan = Welsh adaptation by : Esyllt Nest Roberts.
Argraffiad Saesneg gwreiddiol = Original English edition : New York : Bantam Doubleday Dell, 1996.
Gêm wallgo by Gary Paulsen. ISBN 086381865X. Published by Gwasg Carreg Gwalch in 2003. Publication and catalogue information, links to buy online and reader comments.