@unpublished{repository19181,
           title = {Geometri Analitika 5A},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/19181/},
          author = {Slamet Soro, SS}
}