Saragih M, Harahap R, Bako EN. The Impact of Product Innovation, Restaurant Atmosphere, and Promotion Strategies on Sales Performance: Evidence from Song Fa Bak Kut Teh Restaurant, Medan. Glob. Insights Manag. Econ. Res. [Internet]. 2025 Aug. 27 [cited 2026 Mar. 2];1(3):122-31. Available from: https://journal.igiinsight.com/index.php/gimer/article/view/36