1. R. E. Buchanan and N. E. Gibbons, “Bergey′s Manual of Determinative Bacteriology,” 8th Ed., The Williams and Wilkins Company/Baltimore, 1974.
2. R. E. Gordon, W. C. Haynes and C. H. N. Pang, “The GenusBacillus,” Agriculture Handbook No. 427, Agricultural Research Service. United States Department of Agriculture, Washington D. C., 1973.
3. H. R. Maurer, “Disc Electrophoresis and Related Techniques of Polyacrylamide Gel Electrophoresis,” Walter de Gruyter, 1971.