Maknunah, Lu’lu Ul, and Hanik Amaria. “The Influence of Customer Service and Product Diversification on Customer Loyalty”. Jurnal Ilmiah Manajemen Kesatuan 13, no. 6 (November 30, 2025): 5205–5216. Accessed June 4, 2026. https://jurnal.ibik.ac.id/index.php/jimkes/article/view/4245.