Singh, Onkar, et al. “Growth, Nodulation, Yield and Nutrient Uptake of Urdbean (Vigna Mungo L. Hepper) As Influenced by Sulphur and Iron Fertilization in Light Textured Soil”. International Journal of Bio-Resource and Stress Management, vol. 7, no. Aug, 4 Spcl, June 2023, pp. 693-8, https://ojs.pphouse.org/index.php/IJBSM/article/view/951.