Burhan, I., Sari, S. N. and Saleh, F. I. (2022) “The gross up method in the calculation of Income Tax article 21”, Income Journal: Accounting, Management and Economic Research, 1(3), pp. 80–87. Available at: https://income-journal.com/index.php/income/article/view/15 (Accessed: 4 November 2025).