Fadil, Khaidir, Mahmud Arif, Noor Isna Alfaien, Amran Amran, Abroto Abroto, & Ayunda Rahma. " Free education policy and hidden cost inequality: A literature review on indirect economic burdens on students’ families." Proceeding of International Conference on Islamic Education (ICIED) [Online], 10.1 (2025): 1202-1212. Web. 3 Feb. 2026