@unpublished{repository26678,
            note = {Unpublished},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