Atere, A. D., F. K. Ayenogun, B. D. Akinbo, A. M.-J. Okafor, and K. I. Egbuchulem. “Assessment of Methaemoglobin and Carboxyhaemoglobin Levels Among Pregnant Women Infected With Hepatitis B Virus”. Advances and Trends in Biotechnology and Genetics Vol. 2, Oct. 2019, pp. 75-81, https://stm1.bookpi.org/index.php/atbg-v2/article/view/525.