2) BUCHANAN, R. E. & N. E. GIBBONS, Edited: BERGEY'S Manual of Determinative Bacteriology. Eighth Edition, The Williams and Wilkins Company, Baltimore, 1974
3) SKERMAN, V. B. D., Edited: A Guide to the Identification of the Genera of Bacteria. Second Edition, The Williams and Wilkins Company, Baltimore 1967
4) Society of American Bacteriologists: Manual of Microbiological Methods. McGraw-Hill, New York, 1956
5) GIBBS, B. M. & D. A. SHAPTON, Edited: Identification Methods for Microbiologists. Part B. Academic Press, London-New York, 1968