● Angen Ø,Ahrens P,Kuhnert P,Christensen H,Mutters R (2003). Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'. Int. J. Syst. Evol. Microbiol.53, 1449-56.