APA
World Health Organization, . (1999). Influenza pandemic preparedness plan: the role of WHO and guidelines for national and regional planning. Geneva: World Health Oraganization.
Chicago
World Health Organization, . 1999. Influenza pandemic preparedness plan: the role of WHO and guidelines for national and regional planning. Geneva: World Health Oraganization.
Harvard
World Health Organization, . (1999). Influenza pandemic preparedness plan: the role of WHO and guidelines for national and regional planning. Geneva: World Health Oraganization.
MLA
World Health Organization, . Influenza pandemic preparedness plan: the role of WHO and guidelines for national and regional planning. Geneva: World Health Oraganization. 1999.