Karim, K.M.R., Parvin, F. and Ali, L. 2012. Plasma Homocysteine, Folate and Vitamin B₁₂ in Different Trimester of Pregnancy. Bangladesh Journal of Nutrition. 22, (Dec. 2012), 69–79. DOI:https://doi.org/10.3329/bjnut.v22i0.12833.