Yup
All your PPL books from cover to cover. A must. Also, a copy of LASORS is essential as you need to know all the rules and regs for licence issue, revalidation, renewal.
You could buy that Campbell book, but personally I found it too wordy and hence is still in mint condition and happily working as a book end.
Another good set of books to buy (if you can get your mitts on them) is the Flight Briefing for Pilots (Vol 1-4) by NH Birch and AE Bramson. Absolutely top class books written in a bye-gone days where pilots were called aviators and wore silly hats, smoked pipes, had bum-spankingly cool moustaches and were generally called reginald. Ah, to be young again.