@phdthesis{UNY18805,
            year = {2012},
          school = {Fakultas Matematika dan Ilmu Pengetahuan Alam},
           title = {PENGEMBANGAN TEACHING MATERIAL MATERI IKATAN KIMIA SMA
KELAS X SEMESTER 1},
          author = {Eugenius Ewito},
             url = {http://eprints.uny.ac.id/18805/}
}