1. Carter GR: Diagnostic Procedures in Veterinary Bacteriology and Mycology, 4th ed., pp. 208–214. CC Thomas, Springfield, IL, 1984
2. Porcine Abortions Associated with Fungi, Actinomycetes, and Rhodococcus sp
3. Gillespie JH, Timoney JF: Hagen and Bruner's Infectious Diseases of Domestic Animals, 7th ed., pp. 238–243. Comstock Publishing Associates, Ithaca, NY, 1981