Cyhoeddwyd y stori Saesneg wreiddiol yn = Original English story published in : 'Monty, the dog who wears glasses' : London : A & C Black, 1989.
Sbeic yn yr ysgol by Colin West. ISBN 1860854052. Published by Uned Iaith Genedlaethol Cymru CBAC in 1999. Publication and catalogue information, links to buy online and reader comments.