the advancing guitarist , by mick goodrick(... even if its beyond where you are at it will become super useful and surely several would agree that its an exciting book).
well, its tricky to recommend things because without knowing you or what you can do the things that come to mind seem to fall under 2 categories:
things that deal with actual harmony or changes etc.
and books that deal with mechanics of guitar playing.
for the mechanics stuff, the berkelee books ( william leavit ) and some others such as the books by brett wilmott are good. they could be dense or dry but provide information and graded exercises that make you deal with reading and get the sound in your ear of changes happening : harmonic things expressed melodically.
later, other dry yet deep books like george van epps' hamonic mechanisms vol 123 , ted greene's: chord chemistry and single note soloing vol 1 2 , and modern chord progressions. these are books that are dry yet give you a good amount of information that is for the most part very pracvtical and would force you to deal with certain guitar stuff to execute them. they are daunting but even if you glean2% of any page you will be doing yourself a huge favor.