@unpublished{repository40447,
           title = {Chujokyuu Choukai 4B},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/40447/},
          author = {Natalia, Ana}
}