Tortora, G. J., Funke, B. R., & Case, C. L. (2004). Microbiology: An introduction (Eight edition.). Benjamin Cummings ; Pearson education.

Tortora, Gerard J., Berdell R. Funke, and Christine L. Case. Microbiology: An Introduction. Eight edition. San Francisco, CA : New Delhi: Benjamin Cummings ; Pearson education, 2004.

Tortora, Gerard J., et al. Microbiology: An Introduction. Eight edition. Benjamin Cummings ; Pearson education, 2004.