@unpublished{repository50688,
           title = {Perangkat Perkuliahan Teach math in english},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof DR HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/50688/},
          author = {Awalludin, Subhan Ajiz}
}