@unpublished{repository48118,
           title = {Bukti Proto 4A},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/48118/},
          author = {Nikmatullah, Nurul Azmah}
}