@unpublished{repository32104,
            note = {Unpublished},
           title = {MATEMATIKA EKONOMI 3A},
       publisher = {UNIVERSITAS MUHAMMADIYAH PROF. DR. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/32104/},
          author = {Nur Busyra, Busyra}
}