On Tashcen’s website (fantastic selection of art books btw) I came across this book:
Chronicling graffiti art and street art is, to say the least, difficult. The shadow of illegality, preference for anonymity, and the spectre of the criminal element complicate the process which is, in my opinion, unfortunate because graffiti art is a genre packed with significance and relevant commentary that is lacking in much of the art world en large.
This looks like a great and well-researched book that incorporates great plates and first hand accounts from the artists themselves. Domestic and international trends in graffiti art are covered and it even includes a preface by reclusive Banksy–how cool is that!