1. R. N. Doetsch, in “Manual of Methods for General Bacteriology,” ed. by P. Gerhardt, American Society for Microbiology, Washington, 1981, pp. 21–33.
2. R. M. Smibert and N. R. Krieg, in “Manual of Methods for General Bacteriology,” ed. by P. Gerhardt, American Society for Microbiology, Washington, 1981, pp. 409–443.