@unpublished{repository51446,
       publisher = {Universtas Muhammadyah Prof. DR. Hamka},
           title = {surat tugas dan sertifikat les bahasa inggris},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/51446/},
          author = {Mayarni, Mayarni}
}