@unpublished{repository20133,
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
           title = {Surat Tugas dan Sertifikat Webinar},
            note = {Unpublished},
          author = {Mayarni, Mayarni},
             url = {http://repository.uhamka.ac.id/id/eprint/20133/}
}