@unpublished{repository5440,
           title = {Document JPBS},
            year = {2021},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/5440/},
          author = {Wulandari, Nora}
}