Ribur Sinaga, Sari Khowajan Tondang, Eva Ratna Dewi, Marliani, Ali Imran Sirait, and D. S. Butarbutar, “Comparison of Labor Duration by Parity Among Mothers at Rizki Clinic, Medan Tembung District”, JUKEKE, vol. 5, no. 1, pp. 394–407, Feb. 2026.