@unpublished{repository44928,
            note = {Unpublished},
           title = {Surat tugas ADI},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/44928/},
          author = {Zulherman, Zulherman}
}