APA (7th ed.) Citation

(1981). Genetic variation among influenza viruses. Acad. Pr.

Chicago Style (17th ed.) Citation

Genetic Variation Among Influenza Viruses. New York u.a: Acad. Pr, 1981.

MLA (9th ed.) Citation

Genetic Variation Among Influenza Viruses. Acad. Pr, 1981.

Warning: These citations may not always be 100% accurate.