@unpublished{repository48512,
           title = {Sertifikat Narsum LDKS SMKN 52},
       publisher = {SMKN 52 Jakarta},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/48512/},
          author = {Tri Widiastuti, Haning}
}