Adler, Mortimer J., and Charles Van Doren. How to Read a Book: The Classical Guide to Intelligent Reading. Revised and Updated edition. 1940. Reprint, Touchstone, 2011.
Edmund Gröpl's concept map of Adler & Van Doren's How to Read a Book via https://forum.zettelkasten.de/discussion/comment/20668#Comment_20668: