@unpublished{repository29890,
            note = {Unpublished},
           title = {K1},
       publisher = {FFS UHAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/29890/},
          author = {Nining, Nining and Nursal, Fith Khaira and Algifari, Abu Rijal}
}