1. BREED R. S. MURRAY E. G. D. AND HITCHENS A. P. 1948 Bergey's manual of determinative bacteriology. 6th ed. Williams & Wilkins Co. Baltimore Md.
2. LE MAISTRE W. G. 1949 Personal communication.
3. Cultural studies of Bacillus larvae (White). Sci;LOCHHEAD A. G.;Agr.,1928
4. RIDGWAY R. 1912 Color standards and color nomenclature. Washington D.C.
5. SMITH N. R. GORDON R. E. AND CLARK F. E. 1946 Aerobic mesophilic sporeforming bacteria. U. S. Dept. Agr. Misc. Pub. 559.