http://books.google.com.br/books?id=cR04WvQsQXoC&printsec=frontcover&dq=harmonia+m%C3%A9todo+pr%C3%A1tico+ian+guest&hl=pt-BR&ei=SqWMTpb7NYGvsQKikdiZBA&sa=X&oi=book_result&ct=result&resnum=2&ved=0CEUQ6AEwAQ#v=onepage&q&f=true