@unpublished{repository43623,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
           title = {Undangan, Surat Tugas dan Sertifikat Pengabdian},
             url = {http://repository.uhamka.ac.id/id/eprint/43623/},
          author = {fetrimen, fetrimen}
}