@unpublished{repository26678,
            note = {Unpublished},
           title = {4.5. Sertifikat Penyegaran Auditor},
       publisher = {Universita Muhammadiyah Prof.Dr. Hamka},
             url = {http://repository.uhamka.ac.id/id/eprint/26678/},
          author = {Ervin, Azhar}
}