«Maternal, newborn and child health (MNCH) services utilization: A comparative case study of tertiary and primary health care facilities in Cross River State». (2021) African Journal of Biomedical Research, 24(1), сс. 81–92. доступно на: https://ojshostng.com/index.php/ajbr/article/view/1154 (просмотрено: 2 май 2026).