Aryani Sairun, and Sugito. “Effectiveness of Using Economic Analysis in Managing Digital Marketing Campaigns: A Study in the Service Industry”. Outline Journal of Economic Studies 4, no. 2 (July 18, 2025): 138–145. Accessed September 14, 2025. https://journal.outlinepublisher.com/index.php/OJES/article/view/471.