I'm not going to recommend a book but a concept and a documentary, "Tom Dowd & the Language of Music.". Take everything out except for the faders. No eq - no effects - no dynamics - no pan. So all you have is your gain stucture/room to work with.
I say this because getting a good mix has become so overcomplicated. When the first mixers came out and they were cutting mixes direct to vinyl (one take - no edits!) - Tom Dowd who was the first engineer to mic individual instuments - so with just the faders there were good engineers and not so good - then there were GREAT engineers. Mastering your own ears - mic placement - room and faders is what makes a GREAT engineer in my opinion. I don't think you have to split every instument into 4 regions and compress them all while running it through three eqs and the latest $9000 mic.
It's such a shame that we get caught up with names and numbers, tubes and trasistors, monitors and modules that we forget to close our eyes and gently move the faders until we hear just the right blend.
There were a few engineers but there were only a couple really, really good ones. It was a brand new skill/talent and Tom Dowd was one of the best at creating the loudest, clearest capture of a performance. His mixes stood out so much which is what it's all about.
Anyway, he say at one point in the film, "but what does it sound like?", in reference to gear and theory.