Zaein, Heryatul Azizah, and Syafruddin Rais. “The Influence of Excellent Service and Effective Communication on Customer Loyalty at Excelso Vitka Point Tiban Batam”. Jurnal Indonesia Sosial Sains 5, no. 11 (December 3, 2024): 3011–3020. Accessed August 2, 2025. https://jiss.publikasiindonesia.id/index.php/jiss/article/view/1511.