“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: Jul. 03, 2025. [Online]. Available: https://insla.usim.edu.my/index.php/eproceeding/article/view/28