«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), p. 81–92. Disponible a: https://ojshostng.com/index.php/ajbr/article/view/1154 (Consulta: 2 maig 2026).