But talking technically Schoenberg's "Composition" book is good as far as I have read it , some books take music creating as a silly and easy task but Schoenberg sees it as a devoted artist should see music , it's not something that you can rely on "For Dummies" or etc...this is a serious job.
and if you are a pirate you can use this link :
http://thepiratebay.sx/torrent/4630039/Books_on_Music_Theory_(Harmony__Counterpoint__Orchestration)_[in
This link contains a lot of good books in music and composition but you should be a pirate to use it! (it is illegal in some countries but not mine)