Bowden, Geroge H. W. (1996). "Actinomyces, Propionibacterium propionicus, and Streptomyces". In Baron, Samuel (ed.). Medical Microbiology (4th ed.). University of Texas Medical Branch at Galveston. ISBN978-0-9631172-1-2. PMID21413327.
Bowden, Geroge H. W. (1996). "Actinomyces, Propionibacterium propionicus, and Streptomyces". In Baron, Samuel (ed.). Medical Microbiology (4th ed.). University of Texas Medical Branch at Galveston. ISBN978-0-9631172-1-2. PMID21413327.