Cahyowati, Tri Diah, and Mutiara Leinsove Sara. “Progam Caring Untuk Merentensi Pelanggan Telkom Flexi”. Marcommers : Jurnal Marketing Communication and Advertising 2, no. 1 (December 11, 2019): 1–11. Accessed June 3, 2026. https://publikasi.mercubuana.ac.id/index.php/marcommers/article/view/7345.