Mollah, AH, N Naher, S Rahman, and AM Chowdhury. “Antibody Titre Against 3 Doses of Hepatitis B Vaccine Among Preterm and Term Babies”. Mymensingh Medical Journal 21, no. 1 (November 8, 2012): 109–113. Accessed June 29, 2022. https://www.banglajol.info/index.php/MMJ/article/view/12521.