@unpublished{repository42445,
           title = {Kontrak Kuliah 1A Pendidikan Sejarah},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/42445/},
          author = {Mulyani, Sri}
}