@unpublished{repository3781,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            note = {Unpublished},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