S. E. A. Sihotang, K. U. A. Mas, D. A. Zahara, and S. Mardiah, “The Effect of Unemployment and Poverty Rates on the Human Development Index in North Sumatra from 2013–2024”, IJAR, vol. 2, no. 6, pp. 287–295, May 2026, doi: 10.61730/a9x1ct73.