Unpaid Plastic Bag Discount Analysis Based on Islamic Law Perspective (Case Study on Waralaba Retail X in Ponorogo). INSLA E-Proceedings [Internet]. 2020 Nov. 10 [cited 2026 Feb. 2];3(1):147-54. Available from: http://insla.usim.edu.my/index.php/eproceeding/article/view/28