"How to talk about books you haven't read" by Pierre Bayard is another interesting book on this subject. I presume Derrida is not much liked around here but this excerpt is pure gold from the Derrida documentary https://youtu.be/tdumO88JMxw: (Derrida shows his library to the interviewer) "I haven't read all the books that are here" "But you've read most of them? "No, no ... three of four... but I've read those four really, really well."