@unpublished{repository50162,
           title = {Bukti ajar etprof 5b},
       publisher = {Universitas Muhammadiyah Prof Dr. HAMKA},
            note = {Unpublished},
          author = {Hamid Al Jufri, Jufri},
             url = {http://repository.uhamka.ac.id/id/eprint/50162/}
}