@unpublished{repository10159,
            note = {Unpublished},
       publisher = {UHAMKA},
           title = {Laporan Akhir Penelitian Rancob Matematika Ekonomi},
             url = {http://repository.uhamka.ac.id/id/eprint/10159/},
          author = {Leni Marlena, Leni}
}