With ebooks I've purchased, I use the ISBN like any other book and it has almost always found it in the Goodreads database. For others, once you find any edition, there are ways to search and filter to see the ebook editions. I usually just pick one that is not specifically the Kindle version.
As to the percentage thing. I'm a NOOK user, so it doesn't directly give that data. It does give me "on pg x out of x" info, which is ludicrously simple to calculate a percentage from.
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