Permatasari, Yofi, and Wilma Silalahi. “The Validity of Electronic Sales and Purchase Agreements in Indonesian Civil Law: A Law of Obligations Perspective: English”. Journal of Business, Management, and Social Studies 5, no. 2 (June 15, 2025): 85–92. Accessed June 28, 2025. https://jbms.site/index.php/JBMS/article/view/122.