@unpublished{repository34055,
           title = {konsep dasar ipa 2},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof.DR.HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/34055/},
          author = {Zulherman, Zulherman}
}