@unpublished{UNY2427,
          school = {UNY},
           title = {Peningkatan Aktivitas Belajar Siswa Sekolah Menengah Pertama (SMP) Negeri 5 Wates Melalui Model Pembelajaran Problem-Based Learning (PBL)},
          author = {Suryadi Nicolaus},
             url = {http://eprints.uny.ac.id/2427/}
}