A.M. Aliyu, Maryam Aliyu Yakasai, and Afusat Bola Rufai. “Prevalence and Risk Factors Associated With Hepatitis B Virus Coinfection With HIV Amon Patients Attending Some Selected Hospitals in Kaduna Metropolis”. Scientific Journal of Pure and Applied Sciences, vol. 4, no. 10, Oct. 2015, pp. 193-9, http://www.sjournals.com/index.php/sjpas/article/view/285.