@unpublished{repository55355,
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
           title = {Surat keretangan aktif kuliah Subhan el hafiz},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/55355/},
          author = {Subhan El Hafiz, Subhan}
}