Siswono, Siswono, Juni Liem, and Arieany Prasetyo. “Analisis Dan Perancangan Sistem ECRM Pada PT Paramitra Media Perkasa”. Journal The Winners 6, no. 2 (September 30, 2005): 95-104. Accessed January 27, 2025. https://journal.binus.ac.id/index.php/winners/article/view/600.