Manurung, Lambok, Slamet Widodo, and Etty Harya Ningsi. “The Role of Social Media in Increasing Umkm Sales in the Digital Era of Deli Serdang Regency”. Sinergi International Journal of Management and Business 3, no. 3 (July 18, 2025): 182–193. Accessed August 20, 2025. https://journal.sinergi.or.id/index.php/ijmb/article/view/817.