Probably the gold standard for such books, wish all the audio DSLs had a book of such quality. Between it and The Computer Music Tutorial Csound is ahead of the rest when it comes to books.
Edit: Was thinking The Computer Music Tutorial was filled with Csound examples but on second thought I don't think it actually is. Been awhile since I last browsed it.
The Csound book is so great though. It would be nice if the orc/sco on the CD that came with it were available. I have the book still but the CD is long gone and so is owning a CD rom drive.
I just came back to csound recently and I think it has taken me about 25 years to actually like the sco. If one is use to a piano roll/DAW, the sco seems utterly ridiculous.
The csound manual now though actually has good working examples too. If I remember, that was not the case when the csound book came out and part of what made it so great too.