Siregar, Ana Febrianti, and Edy Surya. “Perception of Mathematics Teachers Against Implementation of Curriculum 2013”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 33, no. 2 (May 16, 2017): 144–155. Accessed September 19, 2025. https://gssrr.org/JournalOfBasicAndApplied/article/view/7340.