Sari, Tita Elma, and Siswahyudianto Siswahyudianto. “Analysis of Customer Relationship Management Implementation in Maintaining Customer Loyalty in UMKM Bakpia Ahmad’s Family Trenggalek”. Madani: Jurnal Politik dan Sosial Kemasyarakatan 15, no. 1 (February 20, 2023): 225–243. Accessed June 5, 2026. https://ejournal.unisda.ac.id/index.php/MADANI/article/view/4096.