Faroh A, Suyitno A, Zaenuri Z. Open-Ended Problems Improve High-Level Thinking Skills of Vocational High School Students with CPS Learning. cendekia [Internet]. 23Jun.2022 [cited 25May2026];6(2):1869-80. Available from: https://www.j-cup.org/index.php/cendekia/article/view/1422