The link below is to an article that takes a look at how people keep track of their reading, such as bookmarks and dog-earing.
The link below is to an article that looks at the way one person tracks books by using a book journal – perhaps you will find the suggestions helpful and useful. Or, you can do what I do and use Goodreads. There are other ideas in the comments for that article.
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The link below is to an article that looks at ebooks and what information is being tracked by them and ebook readers.