Reddit reviews Graffiti World: Street Art from Five Continents

Depending on the type of work you're doing (advertising/production/etc...) you should check out a variety of books that relate to typography, grid-based and non-grid-based layouts, and some "how to be creative" bullshit from your library. But specific books I would recommend include:

Guerilla Advertising

Marks of Excellence

Graffiti world

Is yours this one?

i've always loved watching the graffiti go by on trains, so i started looking more and more into it. my grandma paints murals for lots of people in their homes, restaurants, etc. and i can't really see a difference between a great mural and a well done commissioned piece on a wall outside other than most murals aren't using letters as a focal point.

there is quite a large difference between gang graffiti and most street art graffiti, the gang graffiti is usually there to mark territories and most street artists tend to avoid the areas where putting up a piece may end up getting them targeted by a gang.

A good resource is the book Graffiti World and the others that have similar covers, i've seen it in a few different libraries, there's a bunch of interviews with tons of different great artists. also, the documentaries "Exit Through the Gift Shop" and "Style Wars" provide great insight into the world of graffiti.