Kirk, J. H., K. S. Glenn, and J. Cullor. “Environmental Mastitis Pathogens Isolated from Bulk Tank Milk Collected on California Dairies: Prevalence and Antibiotic Susceptibility”. The Bovine Practitioner, vol. 39, no. 1, Feb. 2005, pp. 37-42, doi:10.21423/bovine-vol39no1p37-42.