@unpublished{repository54424,
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
           title = {Surat tugas, sertiikat, materi},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/54424/},
          author = {Sri, Nevi Gantini}
}