Y. R. Al-Hakim, “Product Variance and Brand Image Determining Customer Loyalty: Purchase Behavior of Sosro Tea Products”, Studi Ilmu Sosial Indonesia, vol. 2, no. 1, pp. 13–24, Jun. 2022, Accessed: Jun. 19, 2026. [Online]. Available: https://sisijournals.id/index.php/sisi/article/view/16