Ancilla Lina. “Study of the Development of Immanuel Hospital children’s Polyclinic Service Facilities on the Level of Customer Needs and Loyalty”. Jurnal Ilmu Kesehatan Immanuel 18, no. 1 (August 27, 2024): 23–35. Accessed December 22, 2024. https://ojslast.institutkesehatan-immanuel.ac.id/index.php/JIKI/article/view/253.