Marisi Sihombing, Siti Masitoh, Andi Mariono. Effect Of Direct -Problem Based Learning On Critical Thinking In IBDP Students: -. kuey [Internet]. 2023 Dec. 1 [cited 2026 Jan. 17];29(4):3274-9. Available from: https://kuey.net/index.php/kuey/article/view/7555