@unpublished{repository55456,
           title = {Bukti Ajar Kuliah Muamalah Manajemen 4A},
       publisher = {Universitas Muhammadiyah Prof Dr HAMKA},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/55456/},
          author = {Rosyidi, Muhib}
}