Pusparini, Yenny. “Holotranscobalamin and Homocysteine As Biomarkers of Vitamin B12 Deficiency in Elderly Females”. International Journal of Advanced Science and Technology 29, no. 05 (April 15, 2020): 447 - 455. Accessed October 23, 2026. http://sersc.org/journals/index.php/IJAST/article/view/9561.