Firdaus, Laras, Ika Nurani Dewi, Sri Nopita Primawati, Hulyadi Hulyadi, Sabrun Sabrun, and Irham Azmi. 2025. “A Systematic Review of Threshold Concepts in Higher Education: Characteristics, Learning Barriers, and Pedagogical Interventions”. International Journal of Essential Competencies in Education 4 (2): 117-24. https://doi.org/10.36312/qerb8q19.