World Health Organization. Vaccines and Biologicals: Who vaccine-preventable diseases: monitoring system.
Chicago Style (17th ed.) CitationWorld Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
MLA引文World Health Organization. Vaccines and Biologicals: Who Vaccine-preventable Diseases: Monitoring System.
警告：這些引文格式不一定是100％准確.