Gultom, Muhammad Reza Firdaus, and Posma Lumbanraja. “ANALISIS STRATEGI PADA UMKM SEPATU KOTAMA DENGAN PORTER’S FIVE FORCES”. Journal Business Administration: Entrepreneurship and Creative Industry 1, no. 1 (January 30, 2022): 1–10. Accessed August 13, 2025. https://talenta.usu.ac.id/jba/article/view/9040.