@unpublished{repository17810,
           title = {Sertifikat Baitul Arqam},
            year = {2021},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/17810/},
          author = {Agus Rahmadi, Agus}
}