@unpublished{repository53198,
           title = {Sertifikat Pemateri SMA Putra Bangsa},
       publisher = {SMA Putra Bangsa},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/53198/},
          author = {Tri Widiastuti, Haning}
}