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Winslow, C. E. A. (1919). Studies on the classification of the colon-typhoid group of bacteria with special reference to their fermentative reactions. <i> J.Bacteriol. </i><b> 4 </b>: 429-503 .
Fulton, M. (1943). The identity of Bacterium <i>columbensis Castellani</i>. <i> J.Bacteriol. </i><b> 46 </b>: 79-81 .
Jensen, K. T., Frederiksen, W., Hickman-Brenner, F. W., Steigerwalt, A. G., Riddle, C. F., Brenner, D. J. (1992). Recognition of <i>Morganella</i> subspecies, with proposal of <i>Morganella morganii</i> subsp. <i>morganii</i> subsp. nov. and <i>Morganella morganii</i> subsp. <i>sibonii</i> subsp. nov. <i> Department of Clinical Microbiology </i><b> 42 </b> ( 4 ): 613-620 .
Brenner, D. J., Farmer, J. J., Fanning, G. R., Steigerwalt, A. G., Klykken, P., Wathen, H. G., Hickman, F. W., Ewing, W. H. (1978). Deoxyribonucleic acid relatedness of <i>Proteus</i> and <i>Providencia</i> species. <i> Int.J.Syst.Bacteriol. </i><b> 28 </b>: 269-282 .
Jensen, K. T., Frederiksen, W., Hickman-Brenner, F. W., Steigerwalt, A. G., Riddle, C. F., Brenner, D. J. (1992). Recognition of <i>Morganella</i> subspecies, with proposal of <i>Morganella morganii</i> subsp. <i>morganii</i> subsp. nov. and <i>Morganella morganii</i> subsp. <i>sibonii</i> subsp. nov. <i> Int.J.Syst.Bacteriol. </i><b> 42 </b>: 613-620 .