Hasnita, Iskandar, and Nur Aeni. “The Impacts of Problem-Based Learning on English Vocabulary Mastery for Elementary Students”. International Journal of Language, Education, and Literature 1, no. 2 (October 1, 2024): 113–118. Accessed March 25, 2025. http://journal.unm.ac.id/index.php/IJLEL/article/view/3476.