HAUWA UMAR USMAN, H. U. U., and A. I. H. ABUBAKAR IBRAHIM HASSAN. “HEALTH EFFECTS OF AIR POLLUTION ON PREGNANCY”. NIGERIAN JOURNAL OF HEALTH PROMOTION, vol. 8, no. 1, Sept. 2015, https://journals.aphriapub.com/index.php/NJHP/article/view/1977.