Müller, A. E., O'Hara, C. M., Fanning, G. R., Hickman-Brenner, F. W., Swenson, J. M., Brenner, D. J. (1986). <i>Providencia heimbachae</i>, a new species of <i>Enterobacteriaceae</i> isolated from animals. <i> Int.J.Syst.Bacteriol. </i><b> 36 </b>: 252-256 .

Rustigian, R., Stuart, C. A. (1943). Taxonomic relationships in the genus <i>Proteus</i>. <i> Proc.Soc.Exp.Biol.Med. </i><b> 53 </b>: 241-243 .
Hadley, P. (1918). The colon-typhoid intermediates as causative agents of disease in birds: 1. The paratyphoid bacteria. <i> Bull.Rhode Island Agric.Exp.Stat. </i><b> 174 </b>: 1-216 .
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 .

Hickman-Brenner, F. W., Farmer, J. J., Steigerwalt, A. G., Brenner, D. J. (1983). <i>Providencia rustiganii</i>: a new species in the family <i>Enterobacteriaeae</i> formerly known as <i>Providencia alcalifaciens</i> biogroup 3. <i> J.Clin.Microbiol. </i><b> 17 </b>: 1057-1060 .
(1983). Validation of the publication of new names and new combinations previously effectively published outside the IJSB. List No. 11. <i> Int.J.Syst.Bacteriol. </i><b> 33 </b>: 672-674 .

Buttiaux, R., Osteux, R., Fresnoy, R., Morizmez, J. (1954). Les proprietes biochemiques caracteristiques du genre Proteus. Inclusion souhaitable des Providencia dans celui-ci. <i> Ann.Inst.Pasteur (Paris) </i><b> 87 </b>: 375-386 .
Ewing, W. H. (1962). The tribe Proteae: its nomenclature and taxonomy. <i> Int.Bull.Bacteriol.Nomencl.Taxon. </i><b> 12 </b>: 93-102 .

Somvanshi, V. S., Lang, E., Sträubler, B., Spröer, C., Schumann, P., Ganguly, S., Saxena, A. K., Stackebrandt, E. (2006). <i>Providencia vermicola</i> sp. nov., isolated from infective juveniles of the entomopathogenic nematode <i>Steinernema thermophilum</i>. <i> Int.J.Syst.Evol.Microbiol. </i><b> 56 </b>: 629-633 .