● Frankland GC,Frankland PF (1887). Studies on some new microorganisms obtained from air. Phil. Trans. R. Soc. Lond. B 178, 257-287.
● Betty AF,Daniel FS,Alice SW (2002). Chapter21: Bacillus and Similar Organisms. In Bailey and Scotts Diagnostic Microbiology,Edition: 11, pp. 317-324. Edited by . St. Louis: Mosby.
● Gerald LM,John EB, Ralph D (2005). Bacillus Species and Related Genera Other than Bacillus anthracis. In Mandell, Douglas, and Bennett,Edition: 6, pp. 2493-2496. Edited by Thomas F. Pennsylvania: Elsevier Churchill Livingstone.
