ayooooo.... kita baca dan renungkan!

http://books.google.co.id/books?id=AZIZyHLSYasC&printsec=frontcover&dq=ptk&hl=id&ei=LnKiTdnXBI2EvgOFrNWPBQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC0Q6AEwAA#v=onepage&q&f=false