@unpublished{repository55770,
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
            note = {Unpublished},
           title = {4BBK\_BKPopulasiKhusus},
             url = {http://repository.uhamka.ac.id/id/eprint/55770/},
          author = {Hajar{,} Siti, Siti}
}