Nuzulika L, Ambarita A, Pargito. The development of worksheet based on problem-based instruction to improve critical thinking skill of students . tijossw [Internet]. 2022 Jun. 7 [cited 2026 Nov. 3];4(1):252-9. Available from: https://www.growingscholar.org/journal/index.php/TIJOSSW/article/view/218