@unpublished{repository3781,
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
           title = {Ijazah S1, S2, dan S3 Yadi Nurhayadi},
             url = {http://repository.uhamka.ac.id/id/eprint/3781/},
          author = {Nurhayadi, Yadi}
}