Luu, Nguyen Ha Vy. “INVESTIGATING THE EFFECTS OF FREQUENCY LEVELS ON VOCABULARY GAINS THROUGH EXPLICIT TEACHING”. VNU Journal of Foreign Studies 41, no. 6 (December 25, 2025): 186–202. Accessed December 27, 2025. https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/5525.