APA aipamena

Gunning, K. (1999). Echinacea in the treatment and prevention of upper respiratory tract infections.

Chicago Style aipamena

Gunning, K. Echinacea in the Treatment and Prevention of Upper Respiratory Tract Infections. 1999.

MLA aipamena

Gunning, K. Echinacea in the Treatment and Prevention of Upper Respiratory Tract Infections. 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.