@unpublished{repository13454,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
           title = {Bkd-ipa2-01},
          author = {Zulherman, Zulherman},
             url = {http://repository.uhamka.ac.id/id/eprint/13454/}
}