● Whiley RA,Hall LM,Hardie JM,Beighton D (1999). A study of small-colony, beta-haemolytic, Lancefield group C streptococci within the anginosus group: description of Streptococcus constellatus subsp. pharyngis subsp. nov., associated with the human throat and pharyngitis. Int. J. Syst. Bacteriol.49, 1443-9.