Okeke, C. A. F., and U. Ukoha. “Determination of Gestational Age Using Crown-Rump Length and Its Associated Maternal Correlates in Igbos Living in Nnewi: An Ultrasound Study”. International Journal of Health, Medicine and Nursing Practice, vol. 6, no. 3, Mar. 2024, pp. 32-51, doi:10.47941/ijhmnp.1735.