@unpublished{repository40815,
           title = {Sertifikat HAKI \& Surat Tugas},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
          author = {Rismita, Rismita},
             url = {http://repository.uhamka.ac.id/id/eprint/40815/}
}