Oryza Sativa H Sihotang, Putri Adinda Ramadhani, Hutagalung, Nur Indah Rahma Dilla, Zahra Andini, Nadhilah hasibuan and Dewi Agustina 2025. Literature Analysis on the Effectiveness of Referral Systems in Improving Access to Health Services. International Journal of Health, Economics, and Social Sciences (IJHESS). 7, 3 (Jul. 2025). DOI:https://doi.org/10.56338/ijhess.v7i3.7420.