Pekabanda, Kartini, and Yublina Rohi. “Factors Associated With K4 Service Utilization by Pregnant Women in the Working Area of Kambaniru Health Center East Sumba District”. JKP (Jurnal Kesehatan Primer), vol. 3, no. 1, Apr. 2018, pp. 56-65, doi:10.5281/jkp.v3i1.252.