Hasibuan, A.M. and surya, E. (2017) “The Effect of an Open-Ended Approach on Students”, International Journal of Sciences: Basic and Applied Research (IJSBAR), 34(1), pp. 54–63. Available at: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/7484 (Accessed: 5 October 2025).