1. R. N. Doetsch, in “Manual of Methods for General Bacteriology,” ed. by P. Gerhardt, R. G. E. Murray, R. N. Costilow, E. W. Nester, W. A. Wood, N. R. Krieg, and G. B. Phillips, American Society for Microbiolgy, Washington,1981, pp. 21–33.
2. R. M. Smibert and N. R. Krieg, in “Manual of Methods for General Bacteriology,” ed. by P. Gerhardt, R. G. E. Murray, R. N. Costilow, E. W. Nester, W. A. Wood, N. R. Krieg, and G. B. Phillips, American Society for Microbiology, Washington, 1981, pp. 409–443.
3. N. R. Krieg and J. G. Holt, “Bergey’s Manual of Systematic Bacteriology,” Vol. 1, Williams and Wilkins Co., Baltimore, 1984.