Syafitri R, Maisaroh E. Improving Students’ Speaking Ability Through Picture Series: A Classroom Action Research at MTs Darul Ulum Budi Agung Medan . njpi [Internet]. 2025 Oct. 31 [cited 2026 Jan. 21];5(4):994-1006. Available from: http://journal.rumahindonesia.org/index.php/njpi/article/view/1917