Purwanto, Edy, Asep Sumiaji, and Heni Setiana. 2015. “DEVELOPMENTAL DISCUSSION AS AN EFFORT TO IMPROVE THE CRITICALTHINKING OF THE XI GRADE STUDENTS OF SMA NEGERI 5 YOGYAKARTATHROUGH THE SOCIOLOGY SUBJECT”. Pelita - Jurnal Penelitian Mahasiswa UNY 8 (2). https://journal.uny.ac.id/index.php/pelita/article/view/2769.