Omo-Aghoja, Lawrence O, EA Onohwakpor, and JO Omotoso. “Environmental and Socio-Demographic Determinants of the Age at Menarche Among Secondary School Girls in the Niger-Delta Region of Nigeria”. African Journal of Tropical Medicine and Biomedical Research 1, no. 3 (November 3, 2020): 43–49. Accessed October 26, 2021. https://ajtmbr.org.ng/index.php/home/article/view/16.