@unpublished{repository18059,
       publisher = {UHAMKA},
           title = {Buku Ajar},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/18059/},
            isbn = {978-602-425-287-8},
          author = {Supriansyah, Supriansyah}
}