@unpublished{repository49229,
           title = {Surat Tugas Penunjang dan Sertifikat},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/49229/},
          author = {fetrimen, fetrimen}
}