Hasanah, Ana, Suharso Suharso, and Sinta Saraswati. 2015. “Pengaruh Perilaku Teman Sebaya Terhadap Asertivitas Siswa”. Indonesian Journal of Guidance and Counseling: Theory and Application 4 (1). https://doi.org/10.15294/ijgc.v4i1.7485.