“Unpaid Plastic Bag Discount Analysis Based on Islamic Law Perspective (Case Study on Waralaba Retail X in Ponorogo)” (2020) INSLA E-Proceedings, 3(1), pp. 147–154. Available at: https://insla.usim.edu.my/index.php/eproceeding/article/view/28 (Accessed: 3 July 2025).