Abdul Razzaq, A., N. Haider, A. Faiz, M. Naseer, N. Waheed, and H. B. Siddiqui. “Frequency of Vitamin D Deficiency in Children With Iron Deficiency Anaemia and Factors Associated With Vitamin D Deficiency”. Journal of the Pakistan Medical Association, vol. 74, no. 4, Mar. 2024, pp. 626-30, doi:10.47391/JPMA.8042.