Cita APA (7a ed.)

Crawford, D. H. (2000). The invisible enemy: A natural history of viruses. Oxford University Press.

Cita Chicago Style (17a ed.)

Crawford, Dorothy H. The Invisible Enemy: A Natural History of Viruses. Oxford: Oxford University Press, 2000.

Cita MLA (9a ed.)

Crawford, Dorothy H. The Invisible Enemy: A Natural History of Viruses. Oxford University Press, 2000.