Akhmad Syafiq Razan, Effendi Nawawi. Development of a Problem Based Learning Student Worksheet on the Hydrocarbon Topic for Grade XI Students . JPLED [Internet]. 2025 Dec. 20 [cited 2026 Feb. 27];5(4):1145-52. Available from: https://digitalpress.gaes-edu.com/index.php/jpled/article/view/1036