“The Effect of Numbered Heads Together Strategy on Students’ Self-Actualization in English Speaking Skills”. JISIP (Jurnal Ilmu Sosial dan Pendidikan) 10, no. 4 (November 1, 2026): 1932–1937. Accessed November 4, 2026. https://ejournal.mandalanursa.org/index.php/JISIP/article/view/11225.