Nafisatu, K., Ruqayyah, M. H., and Amina, I. M. “Gene Frequencies of ABO/RH (D) Blood Groups and Risk of Hepatitis BVirus Infection Among Students of a Tertiary Institution in North-West Nigeria”. International Journal of Science for Global Sustainability, vol. 7, no. 2, July 2021, p. 8, https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/30.