Sinaga, Yolanda, Rina Octavia Simarmata, Carolina Pakpahan, and Sarma Panggabean. 2023. “Improving Students Vocabulary Mastery by Using Ice Breaker Activities to the First Graders of SMP HKBP Sidorame”. Innovative: Journal Of Social Science Research 3 (2):8237-42. https://j-innovative.org/index.php/Innovative/article/view/1113.