B. Ambarita and S. Purba, “Model Development of Character Educational for the State University of Medan Students”, IJSBAR, vol. 30, no. 5, pp. 1–12, Dec. 2016, Accessed: Sep. 17, 2025. [Online]. Available: https://gssrr.org/JournalOfBasicAndApplied/article/view/6489