@unpublished{repository27866,
           title = {Bukti Ajar Ekonomi Sumber Daya Pekom 4A},
            note = {Unpublished},
       publisher = {UHAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/27866/},
          author = {Supriansyah, Supriansyah}
}