this one is the first ebook m sharing to my dear freinds ,
      chack this it gono helpful to u.,

http://books.google.co.in/books?id=9uEZ177mwhIC&printsec=frontcover&dq=switching+theory+2008+edition&source=bl&ots=ptQ2-WitIe&sig=-76X9GdQqcaVWiSbQ2jwcVsNw-s&hl=en&sa=X&ei=6GA-UPeQIsnPrQf93YDgCg&redir_esc=y#v=onepage&q&f=false