@unpublished{UNY2508,
          school = {UNY},
           title = {PEMODELAN LALU LINTAS JALAN SATU ARAH DENGAN PERSAMAAN DIFERENSIAL},
          author = {Vina, Nur Rochim Vina},
            year = {2005},
             url = {http://eprints.uny.ac.id/2508/}
}