K. Muthuri, J., M. J. K., J. K. Ithinji, I. J. K., R. M. Kirigiah, and K. R. M. “SYMBIOTIC EFFECTIVENESS OF BRADYRHIZOBIUM JAPONICUM USDA 110 AND SINORHIZOBIUM FREDII USDA 191 ON TWO DIFFERENT SOYBEAN CULTIVARS”. European Scientific Journal, ESJ, Vol. 10, no. 12, Apr. 2014, https://eujournal.org/index.php/esj/article/view/3184.