Poudel, Ankita, et al. “Growth and Yield of Cowpea (Vigna Unguiculata L.) Under Different Levels of Phosphorous and Seed Inoculation With Rhizobium ”. Agronomy Journal of Nepal, vol. 7, July 2023, pp. 9-15, doi:10.3126/ajn.v7i1.62056.