Werner, H., Seeliger, H. P. R. (1964). Comparative studies of bifidus strains of various origin. <i> Pathol.Microbiol. </i><b> 27 </b>: 202-215 .
Tissier, H. (1900). Doctoral Thesis.
Orla-Jensen, S. (1924). Classification des bactéries lactiques. <i> Lait </i><b> 4 </b>: 468-474 .

Scardovi, V., Trovatelli, L. D., Biavati, B., Zani, G. (1979). <i>Bifidobacterium cuniculi, Bifidobacterium choerinum, Bifidobacterium boum,</i> and <i>Bifidobacterium pseudocatenulatum</i>: four new species and their deoxyribonucleic acid homology relationships. <i> Int.J.Syst.Bacteriol. </i><b> 29 </b>: 291-311 .

Reuter, G. (1971). Designation of type strains for Bifidobacterium species. <i> Int.J.Syst.Bacteriol. </i><b> 21 </b>: 273-275 .
Reuter, G. (1963). Vergleichenden Untersuchung über die Bifidus-Flora im Sauglings und Erwachsenenstuhl. <i> Zentralbl.Bakteriol.Hyg.I Abt. </i><b> 191 </b>: 486-507 .

Biavati, B., Scardovi, V., Moore, W. E. C. (1982). Electrophoretic patterns of proteins in the genus <i>Bifidobacterium </i>and proposal of four new species. <i> Int.J.Syst.Bacteriol. </i><b> 32 </b>: 358-373 .

Crociani, F., Biavati, B., Alessandrini, A., Chiarini, C., Scardovi, V. (1996). <i>Bifidobacterium inopinatum</i> sp. nov. and <i>Bifidobacterium denticolens</i> sp. nov., two new species isolated from human dental caries. <i> Int.J.Syst.Bacteriol. </i><b> 46 </b>: 564-571 .

Lauer, E. (1990). <i>Bifidobacterium gallicum </i>sp. nov. isolated from human faeces. <i> Int.J.Syst.Bacteriol. </i><b> 40 </b>: 100-102 .

Watabe, J., Benno, Y., Mitsuoka, T. (1983). <i>Bifidobacterium gallinarum</i> sp. nov.: a new species isolated from the ceca of chickens. <i> Int.J.Syst.Bacteriol. </i><b> 33 </b>: 127-132 .

Sakata, S., Kitahara, M., Sakamoto, M., Hayashi, H., Fukuyama, M., Benno, Y. (2002). Unification of <i>Bifidobacterium infantis</i> and <i>Bifidobacterium suis</i> as <i>Bifidobacterium longum</i>. <i> Int.J.Syst.Evol.Microbiol. </i><b> 52 </b>: 1945-1951 .
Reuter, G. (1971). Designation of type strains for Bifidobacterium species. <i> Int.J.Syst.Bacteriol. </i><b> 21 </b>: 273-275 .
Reuter, G. (1963). Vergleichenden Untersuchung über die Bifidus-Flora im Sauglings und Erwachsenenstuhl. <i> Zentralbl.Bakteriol.Hyg.I Abt. </i><b> 191 </b>: 486-507 .