Personally, for me, I just add the same title in any format to my BIR for audio downloads that don't have ISBNs. It's just so I can keep track of what I've read so it doesn't really matter that I don't own that format, and I add a note that says audio download. It isn't like you can trade it here anyway, so my recommendation is to just choose the same title,any format, and rate it and add a note. You did, after all, read it!
On a similar note, I wish I could rate all the formats of the same title but NOT add them to my BIR - sometimes when I'm scanning someone's bookshelf, they will have a title in paperback that I've read in hardcover but have forgotten, and since it isn't rated, I can't tell. yeah, I know, it's my own faulty memory, but if I could rate all the formats, I'd see the rating and realize I already had it. sorry for threadjack...
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