Shalehah, Hasbuna Nikmah, Luqman Baehaqi, and M. Zaini Miftah. “Spaced Repetition for Vocabulary Retention in EFL and ESL Learning: A Systematic Literature Review”. Journal of Research on English and Language Learning (J-REaLL) 7, no. 2 (August 31, 2026): 428–451. Accessed September 4, 2026. https://riset.unisma.ac.id/index.php/JREALL/article/view/25562.