Noval Maulana, Halimatunnisa, M., Yuli Sutomo, S., & Qamal Pa’ni, D. M. (2026). Peer-Group Assertive Communication and Verbal Bullying Scores Among High-School Students: A Quasi-Experimental Study. Gaster, 24(2), 188–200. https://doi.org/10.30787/gaster.v24i2.2581