Sinaga, Yolanda, Rina Octavia Simarmata, Carolina Pakpahan, and Sarma Panggabean. “Improving Students Vocabulary Mastery by Using Ice Breaker Activities to the First Graders of SMP HKBP Sidorame”. Innovative: Journal Of Social Science Research 3, no. 2 (June 6, 2023): 8237–8242. Accessed October 24, 2026. https://j-innovative.org/index.php/Innovative/article/view/1113.