@unpublished{repository27899,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
           title = {ST, Sertifikat, Bahan paparan},
             url = {http://repository.uhamka.ac.id/id/eprint/27899/},
          author = {Martriwati, Martriwati}
}