Cyhoeddwyd y storiau gwreiddiol yn = Original English stories published in : 'Monty, the dog who wears glasses' : London : A & C Black, 1989.
Pam mae Speic yn gwisgo sbectol? by Colin West. ISBN 1860854079. Published by Uned Iaith Genedlaethol Cymru CBAC in 1999. Publication and catalogue information, links to buy online and reader comments.