Inspect all of the books on your bibliography to decide which are relevant to your subject, and to better define the subject. As you research, you may find that your subject is more difficult to define than you imagined. Imagine love, which has been attributed to everything in the universe. Do we speak of love etc — You may have to iterate between reading works and defining your subject.
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How to read a book,by Mortimer Adler
When you read a book, do you find yourself forgetting what you read? Do you regret wasting time on books that you should have skimmed instead?