Agustono, B. ., K. M. . Affandi, and Junaidi. “Benih Mardeka and Plantation Workers in East Sumatra, 1916–1923”. Kasetsart Journal of Social Sciences, vol. 45, no. 1, Dec. 2023, pp. 225–234, https://so04.tci-thaijo.org/index.php/kjss/article/view/269486.