@unpublished{repository11157,
           title = {EPHB 6A,6B,6C},
       publisher = {Universitas Muhammadiyah Prof. DR. Hamka},
            note = {Unpublished},
          author = {Slamet Soro, SS},
             url = {http://repository.uhamka.ac.id/id/eprint/11157/}
}