Manan, Alamzeb. “PREVALENCE OF HBsAg IN ADULTS NEEDING ENDOSCOPY AND ITS LIKELY AETIOLOGICAL FACTORS”. Journal of Ayub Medical College Abbottabad, vol. 10, no. 1, Feb. 1998, pp. 3-4, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/4797.