APA aipamena

de Guzman, O. (2001). Viruses: The unseen enemies. Health Today.

Chicago Style aipamena

de Guzman, Orange. "Viruses: The Unseen Enemies." Health Today 2001.

MLA aipamena

de Guzman, Orange. "Viruses: The Unseen Enemies." Health Today, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.