Deintydd Dieflig /
Walliams, David,1971-author.
Antur, Gruffudd,1992-translator.
Ross, Tony,illustrator.
Cyhoeddwyd y testun gyntaf fel cyfrol clawr caled ym Mhrydain Fawr gan Harper Collins Children's Books yn 2013 = Originally published as large volume hardback in Britain by Harper Collins Children's Books, 2013.