This was one of my favorite books when it came out when I was in high school. Finally got it autographed years later:
FIGHT THE POWER by Chuck D
And I have no idea who has my original copy of this jewel cuz it got passed around so many times, but for any cats that used to (or still do) get up with the spray paint, this is a must have:
THE ART OF GETTING OVER: GRAFFITI AT THE MILLENIUM by Stephen Powers
And this is still one of the most important books I ever read as far as help shaping my outlook on life (at the time anyway), the importance of developing consciousness, and understanding how power structures in society shape everything we think and do. And it has a ton of interviews from hip-hop personalities in it. First read it back in 2000, fantastic book:
NO MORE PRISONS by William "Upski" Wimsatt