Sipayung, Eva Cristin, dan Marisi Debora. “Students™ Perceptions on The Use of Numbered Head Together Technique in Teaching Reading Comprehension”. TRANSFORM: Journal of English Language Teaching and Learning 12, no. 3 (Oktober 26, 2023): 140–156. Diakses September 30, 2026. https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/52341.