Kusumawati, Eny, Diana Dewi Wahyunigsih, and Imam Setyonugroho. 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):44-51. https://doi.org/10.29407/nor.v8i1.15693.