@unpublished{repository4048,
           title = {LAMPIRAN 3. CONTOH PTK},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/4048/},
          author = {Tri Wintolo Apoko, Tri}
}