Cahyono, Hendry, Waspodo Tjipto Subroto, and Khoirul Anwar. “Income Disparity in Gerbangkertosusila Area of East Java Indonesia”. International Journal of Economics and Financial Issues 7, no. 1 (January 13, 2017): 14–18. Accessed May 28, 2022. https://www.econjournals.com/index.php/ijefi/article/view/2868.