Sinaga, Jonathan Halomoan, and Selviana Napitupulu. “Vocabulary Mastery Challenges Among Indonesian Public Junior High School Students”. Jurnal Ilmu Sosial dan Humaniora 4, no. 1 (January 31, 2026): 177–184. Accessed April 27, 2026. https://www.putrapublisher.org/index.php/isihumor/article/view/1379.