Publication originale(en) DC. Jordan, « Transfer of Rhizobium japonicum Buchanan 1980 to Bradyrhizobium sp. nov., a genus of slow-growing, root nodule bacteria from leguminous plants. », Int. J. Syst. Bacteriol., vol. 32, no 1, , p. 136-139 (DOI10.1099/00207713-32-1-136).