@unpublished{repository16744,
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
           title = {sertifikat SLR},
            note = {Unpublished},
        abstract = {sertifikat SLR},
             url = {http://repository.uhamka.ac.id/id/eprint/16744/},
          author = {Zulherman, Zulherman}
}