Yunita Dalimunthe, Isra Suna Hasibuan. Development of Learning Problem Based Learning to Increase Mathematical Connection Ability Students of SMK Darul Arqom Kerasaan. IJHESS [Internet]. 2025 Feb. 15 [cited 2026 May 2];4(4). Available from: https://ijhess.com/index.php/ijhess/article/view/1517