Hastuti, D.; Insan, A. N. .; Bidol, S. . THE EFFECTIVENESS OF IMPLEMENTING 5S (SMILE, GREET, SAY HELLO, POLITENESS, AND COURTESY) IN SERVICE DELIVERY AT UPTD RSD DR. H. SOEMARNO SOSROATMODJO, TANJUNG SELOR, BULUNGAN REGENCY, NORTH KALIMANTAN. Jurnal Hasil Penelitian/JEINSA 2026, 5, 136-148.