@manual{repository2228,
           title = {surat und , tugas, sertifikat, materi sma 28 2019 no 32},
            type = {Documentation},
       publisher = {MM UHAMKA},
          author = {Bambang, Dwi Hartono},
             url = {http://repository.uhamka.ac.id/id/eprint/2228/}
}