@unpublished{repository50619,
           title = {Perangkat Perkuliahan Matematika Dasar PGSD},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof DR HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/50619/},
          author = {Wahidin, Wahidin}
}