(1988). Smallpox and its eradication. Genève: OMS.
Chicago Style CitationSmallpox and Its Eradication. Genève: OMS, 1988.
Cita MLASmallpox and Its Eradication. Genève: OMS, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA