Harahap, K. (2022) “PROTOTYPE DESIGN OF DIFFERENTIATION STRATEGY APPLICATION: (Case Study on Restaurants at Medan City)”, Jurnal Ekonomi, 11(02), pp. 1098–1106. Available at: https://ejournal.seaninstitute.or.id/index.php/Ekonomi/article/view/460 (Accessed: 1 September 2026).