@unpublished{repository51599,
           title = {SURAT TUGAS PEMAKALAH INTERNASIONAL},
       publisher = {Universitas Muhammadiyah Prof DR Hamka},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/51599/},
          author = {Hendra Apriyadi, Hendra}
}