@phdthesis{UNY2278,
            year = {2010},
          school = {UNY},
          author = {Nurmala Wina},
           title = {MENINGKATKAN AKTIVITAS DAN HASIL BELAJAR MATEMATIKA MELALUI MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEAD TOGETHER (NHT) DI SMA KOLOMBO },
           month = {July},
             url = {http://eprints.uny.ac.id/2278/}
}