Syed Zain Ul Abideen, et al. “Frequency of Vitamin B12 Deficiency Anemia in Diabetic Patients on Metformin in a Tertiary Care Hospital, Lahore, Pakistan”. Indus Journal of Bioscience Research, vol. 3, no. 7, July 2025, pp. 1681-5, https://doi.org/10.70749/ijbr.v3i7.3010.