Penumadu, K. M., and C. Hariharan. “Role of Partogram in the Management of Spontaneous Labour in Primigravida and Multigravida”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 3, no. 4, Feb. 2017, pp. 1043-9, https://www.ijrcog.org/index.php/ijrcog/article/view/2225.