Hasnat, Fahmida, Habiba Akhter Bhuiyan, and Mir Misbahuddin. “Estimation of Vitamin B12 in Plasma by High Performance Liquid Chromatography”. Bangladesh Journal of Pharmacology 12, no. 3 (July 12, 2017): 251–255. Accessed May 23, 2022. https://www.banglajol.info/index.php/BJP/article/view/33108.