Arg. Saesneg gwreiddiol = Original English ed.: Kingfisher Books, 1991.
Cawl lloerig : wnewch chi byth ddyfalu beth sy'n digwydd nesaf! by Alastair Graham. ISBN 0948930977. Published by Cymdeithas Lyfrau Ceredigion in 1995. Publication and catalogue information, links to buy online and reader comments.