@unpublished{repository32110,
           title = {MATEMATIKA EKONOMI 3B},
            note = {Unpublished},
       publisher = {UNIVERSITAS MUHAMMADIYAH PROF. DR. HAMKA},
          author = {Nur Busyra, Busyra},
             url = {http://repository.uhamka.ac.id/id/eprint/32110/}
}