World Health Organization. Vaccines and Biologicals: Who vaccine-preventable diseases: monitoring system.
Chicago-Zitierstil (17. Ausg.)World Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
MLA-Zitierstil (8. Ausg.)World Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.