World Health Organization. (2000). International travel and health: Vaccination requirements and health advice. World Health Organization.
芝加哥风格引文World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. Geneva: World Health Organization, 2000.
MLA引文World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. World Health Organization, 2000.
警告：这些引文格式不一定是100％准确.