@unpublished{repository26668,
           title = {1.4. Isu-isu Pemb.Matematika Mutakhir-Bukti Kinerja},
       publisher = {Universita Muhammadiyah Prof.Dr. Hamka},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/26668/},
          author = {Ervin, Azhar}
}