Nasir, Muhamad, et al. “Effect of Rhizobium Inoculation and Phosphate Fertilizer on The Growth of Soybean (Glycine Max L) Grobogan Variety”. Sains Natural: Journal of Biology and Chemistry, vol. 13, no. 3, Aug. 2023, pp. 161-7, doi:10.31938/jsn.v13i3.462.