● Brenner DJ,Grimont PA,Steigerwalt AG,Fanning GR,Ageron E,Riddle CF (1993). Classification of citrobacteria by DNA hybridization: designation of Citrobacter farmeri sp. nov., Citrobacter youngae sp. nov., Citrobacter braakii sp. nov., Citrobacter werkmanii sp. nov., Citrobacter sedlakii sp. nov., and three unnamed Citrobacter genomospecies.
Int. J. Syst. Bacteriol. 43, 645-58.
● Young VM,Kenton DM,Hobbs BJ,Moody MR (1971). Levinea, a New Genus of the Family Enterobacteriaceae.
Int. J. Syst. Bacteriol. 21, 58-63.
● Frederiksen W (1970). Citrobacter koseri (n. sp.), a new species within the genus Citrobacter, with a comment on the taxonomic position of Citrobacter intermedium (Werkman and Gillen).
Publ. Fac. Sci. Univ. J. E. Purkyne Brno 47, 89-94.