Jannah, Aziyah Miftakhatun, Mahmud Syarif, and Desy Tri Anggarini. 2026. “The Effect of Customer Relationship Management and Service Quality on Customer Loyalty at PT Sinar Biru Sentosa, Jakarta”. Income Journal Of Economics Development 6 (2):363-78. https://doi.org/10.54065/ijed.6.2.2026.880.