I inadvertently stumbled upon a process in grad school when I was writing a paper. I was having a hard time keeping track of where the quotes were in different books, so I made a Word document—and I still have these original Word documents—that’s just the bibliographic information at the top that you would need to put in your footnotes, and then just page numbers and quotes. So for each book, I’d have a document containing all the quotes that I thought I might use for a paper. It just made writing my paper so much easier, so after that, for any book that I read that I thought I might reference in the future, I’d just use that process.