Reply To: ISBN
Good question.
All the examples show the abbreviation being used, but as far as I can tell, your situation isn't covered in any of the manuals.
I suppose it would be an agency decision or....
If this is for a manuscript certification, the transcriber would need to make a decision how to handle this and then include an explanation in the letter to the grader.
Sorry I don't have a cut and dry answer for you.
Saralyn