@unpublished{repository19563,
           title = {Bukti Ajar 7E},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. Dr. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/19563/},
          author = {Chandra Dewi S., CDS}
}