@unpublished{repository45744,
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
            note = {Unpublished},
           title = {Bukti ajar SI 1},
             url = {http://repository.uhamka.ac.id/id/eprint/45744/},
          author = {Hamid Al Jufri, Jufri}
}