World Health Organization. Vaccines and Biologicals: Who vaccine-preventable diseases: monitoring system.
Chicago-referens (17:e uppl.)World Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
MLA-referens (8:e uppl.)World Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.