Marisi Sihombing, Siti Masitoh and Andi Mariono 2023. Effect Of Direct -Problem Based Learning On Critical Thinking In IBDP Students: -. Educational Administration: Theory and Practice. 29, 4 (Dec. 2023), 3274–3279. DOI:https://doi.org/10.53555/kuey.v29i4.7555.