Piane, G., and P. C. Azubuike. “Analyzing Maternal Mortality in Nigeria: A Qualitative Study Approach Using the Three Phases of Delay”. Journal of Health Promotion and Behavior, vol. 8, no. 1, Jan. 2023, pp. 22-33, https://thejhpb.com/index.php/thejhpb/article/view/292.