O. Chinwe, A., J. . Nnodim, N. . Constance, and O. . Hope. “Maternal Alloimmunization As a Risk Factor of Haemolytic Disease of the Foetus and Newborn in Owerri Metropolis, Nigeria”. Pure and Applied Science Advances, vol. 2, no. 10, Oct. 2013, pp. 341-7, https://sjournals.com/index.php/sjpas/article/view/962.