@unpublished{repository23998,
            note = {Unpublished},
           title = {Surat Haki dan Bukti Kinerja},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
          author = {Hamid Al Jufri, Jufri},
             url = {http://repository.uhamka.ac.id/id/eprint/23998/}
}