Indrayani, Ninuk, and Sofkhatin Khumaidah. “Designing Unlocked Gramm Application to Promote students’ Self-Directed Learning”. JEES (Journal of English Educators Society) 8, no. 1 (April 6, 2023). Accessed November 23, 2024. https://jees.umsida.ac.id/index.php/jees/article/view/1716.