Batrisyia, Quandizza, and Sinari Maydena. “Impact of Free Shipping Promotion on Product Purchase Decisions in E-Commerce Shopee During Covid-19 Pandemic”. International Journal Administration, Business & Organization 2, no. 2 (October 30, 2021): 12-19. Accessed May 17, 2024. https://ijabo.a3i.or.id/index.php/ijabo/article/view/177.