@unpublished{repository28797,
            note = {Unpublished},
           title = {bukti ajar kedokteran olahraga},
       publisher = {Universitas Muhammadiyah Prof. Dr. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/28797/},
          author = {Wawan Budisusilo, Wawan}
}