“Unpaid Plastic Bag Discount Analysis Based on Islamic Law Perspective (Case Study on Waralaba Retail X in Ponorogo)”, INSLA E-Proceedings, vol. 3, no. 1, pp. 147–154, Nov. 2020, Accessed: Feb. 02, 2026. [Online]. Available: http://insla.usim.edu.my/index.php/eproceeding/article/view/28