Book mentions are found by checking every reddit comment for links to Amazon, Goodreads, Google Books, and O'Rielly Media. Non-link mentions are too tricky to parse in an unbiased way: books with short, simple titles like The Road get massively under- or over-counted.
I tried my best to combine cases where the same book has multiple ISBNs with slightly different titles or editions.
When a user mentions the same book multiple times in the same subreddit, I only count the top-voted comment. This curbs users shilling a particular book, and gives a more representative feel for an entire subreddit.
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Amazon affiliate links are used for most books. These help fund this site, and don't impact how books are ranked.