Zahroni, Ana, et al. “PERBANDINGAN HASIL BELAJAR FISIKA SISWA KELAS X YANG DIAJARKAN MODEL GROUP INVESTIGATION DENGAN MODEL TWO STAY TWO STRAY”. PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL), vol. 4, Oct. 2015, pp. SNF2015-I, https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/4663.