Wolfenden, R.; Pumford, N.; Morgan, M.; Shivaramaiah, S.; Wolfenden, A.; Tellez, G.; Hargis, B. Evaluation of a Screening and Selection Method for Bacillus Isolates for Use As Effective Direct-Fed Microbials in Commercial Poultry. Int. J. Poult. Sci. 2010, 9 (4), 317–323. https://doi.org/10.3923/ijps.2010.317.323.