Ramadani, Sri, Rian Andriani, and Kahar Mulyani. 2026. “Competitive Strategies for Hospitals to Enhance Patient Loyalty at Mahkota Bidadari General Hospital in Langkat Regency, North Sumatra”. Jurnal Indonesia Sosial Sains 7 (6):2701-17. https://doi.org/10.59141/jiss.v7i6.2384.