Sartika, Iik, and Ahyar Mahasin. “Analysis of The Implementation of Online Referral for National Health Security Participant At PKU Muhammadiyah Karanganyar Hospital”. STRADA Jurnal Ilmiah Kesehatan, vol. 9, no. 1, May 2020, pp. 286-9, doi:10.30994/sjik.v9i1.323.