Mukhlis, M., B. Robiani, T. Marwa, and R. Chodijah. “Agglomeration of Manufacturing Industrial, Economic Growth, And Interregional Inequality in South Sumatra, Indonesia”. International Journal of Economics and Financial Issues, vol. 7, no. 4, July 2017, pp. 214-2, https://www.econjournals.com/index.php/ijefi/article/view/5008.