@unpublished{repository25897,
           title = {Buku SIM},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/25897/},
          author = {Hamid Al Jufri, Jufri}
}