Dioputra, Marvel Ravindra, and Herbert Siregar. “The Role of Gamification Mechanisms in CRM Systems in Enhancing Customer Loyalty: A Systematic Literature Review”. Jurnal Indonesia Sosial Sains 7, no. 3 (March 14, 2026): 759–771. Accessed March 14, 2026. https://jiss.publikasiindonesia.id/index.php/jiss/article/view/2254.