Collins MD, Hippe H, Lawson PA, Cai J, Garcia P, Farrow JAE, Cordoba JJ, Willems A, Fernandez-garayzabal J
(1994).
The Phylogeny of the Genus Clostridium: Proposal of Five New Genera and Eleven New Species Combinations
Cummins CS, Johnson JL
(1971).
Taxonomy of the Clostridia: Wall Composition and DNA Homologies in Clostridium butyricum and Other Butyric Acid-producing Clostridia