@unpublished{repository38665,
            note = {Unpublished},
           title = {sertifikat EL},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/38665/},
          author = {Eka Kartikawati, Eka}
}