Young, J. M. (2003). The genus name <i>Ensifer</i> Casida 1982 takes priority over <i>Sinorhizobium </i>Chen et al. 1988, and <i>Sinorhizobium morelense</i> Wang et al. 2002 is a junior synonym of <i>Ensifer adhaerens</i> Casida 1982. Is the combination '<i>Sinorhizobium adhaerens</i>' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. <i> Int.J.Syst.Evol.Microbiol. </i><b> 53 </b>: 2107-2110 .
Scholla, M. H., Elkan, G. H. (1984). <i>Rhizobium</i> <i>fredii</i> sp. nov. a fast-growing species that effectively nodulates soybeans. <i> Int.J.Syst.Bacteriol. </i><b> 34 </b>: 484-486 .
Chen, W. X., Yan, G. H., Li, J. L. (1988). Numerical taxonomic study of fast-growing soybean rhizobia and a proposal that <i>Rhizobium</i> <i>fredii</i> be assigned to <i>Sinorhizobium</i> gen. nov. <i> Int.J.Syst.Bacteriol. </i><b> 38 </b>: 392-397 .

Young, J. M. (2003). The genus name <i>Ensifer</i> Casida 1982 takes priority over <i>Sinorhizobium </i>Chen et al. 1988, and <i>Sinorhizobium morelense</i> Wang et al. 2002 is a junior synonym of <i>Ensifer adhaerens</i> Casida 1982. Is the combination '<i>Sinorhizobium adhaerens</i>' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. <i> Int.J.Syst.Evol.Microbiol. </i><b> 53 </b>: 2107-2110 .
Nick, G., De Lajudie, P., Eardly, B. D., Suomalainen, S., Paulin, L., Zhang, X., Gillis, M., Lindström, K. (1999). <i>Sinorhizobium arboris</i> sp. nov. and <i>Sinorhizobium kostiense</i> sp. nov., isolated from leguminous trees in Sudan and Kenya. <i> Int.J.Syst.Bacteriol. </i><b> 49 </b>: 1359-1368 .

Dangeard, P. A. (1926). Recherches sur les tubercles radicaux des Légumineuses. <i> Botaniste </i><b> 16 </b>: 1-275 .
Young, J. M. (2003). The genus name <i>Ensifer</i> Casida 1982 takes priority over <i>Sinorhizobium </i>Chen et al. 1988, and <i>Sinorhizobium morelense</i> Wang et al. 2002 is a junior synonym of <i>Ensifer adhaerens</i> Casida 1982. Is the combination '<i>Sinorhizobium adhaerens</i>' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. <i> Int.J.Syst.Evol.Microbiol. </i><b> 53 </b>: 2107-2110 .
De Lajudie, P., Willems, A., Pot, B., Dewettinck, D., Maestrojuan, G., Neyra, M., Collins, M. D., Dreyfus, B., Kersters, K., Gillis, M. (1994). Polyphasic taxonomy of Rhizobia: emendation of the genus <i>Sinorhizobium</i> and description of <i>Sinorhizobium meliloti</i> comb. nov., <i>Sinorhizobium saheli</i> sp. nov., and <i>Sinorhizobium teranga</i> sp. nov. <i> Int.J.Syst.Bacteriol. </i><b> 44 </b>: 715-733 .
Bergey, D. H., Buchanan, R. E., Gibbons, N. E., (1974). Bergey's manual of determinative Bacteriology. 8th. EditionEdited by R. E. Buchanan, The Williams & Wilkins Co..