Gaya APA
Tortora, G, J. et al (2007).
Microbiology an intoduction (ninth edition).
San Fracisco:
Pearson Benjamin Cummings.
Gaya MLA
Tortora, Gerard, J.. et al.
"Microbiology an intoduction".
ninth edition
San Fracisco:
Pearson Benjamin Cummings,
2007.
Text.