Azizi, M. N., & Siswanto, A. (2025). Implementation of calculation and deduction of income tax article 23 on train washing contracting and on trip cleaning PT. KAI DAOP 9 Jember in the perspective of Islamic economics. Journal of Commerce, Management, and Tourism Studies, 4(3), 512–520. https://doi.org/10.58881/jcmts.v4i3.403