Purnomo, Wulan Andang. “PENERAPAN MODEL E-CRM (COSTUMER RELATIONSHIP MANAGEMENT) PADA PERANCANGAN WEBSITE”. Simtika 3, no. 1 (January 18, 2020): 13–18. Accessed August 3, 2025. https://ejournal.undhari.ac.id/index.php/simtika/article/view/69.