@unpublished{repository3200,
       publisher = {Universitas Muhammadiyah Prof. DR HAMKA},
           title = {Surat Tugas Webinar Sado (PDF)},
            note = {Unpublished},
          author = {Utari, Retno},
             url = {http://repository.uhamka.ac.id/id/eprint/3200/}
}