Kusumawati, E., Wahyunigsih, D. D. and Setyonugroho, I. (2021) “Effectiveness of Group Guidance Services With Role-Playing Techniques to Reduce Student Aggressive Behavior”, Nusantara of Research : Jurnal Hasil-hasil Penelitian Universitas Nusantara PGRI Kediri, 8(1), pp. 44-51. doi: 10.29407/nor.v8i1.15693.