World Health organization. (2012). International travel and health. World Health Organization.
Цитирование в стиле Чикаго (17-е изд.)World Health organization. International Travel and Health. Geneva, Switzerland: World Health Organization, 2012.
Цитирование MLA (8-е изд.)World Health organization. International Travel and Health. World Health Organization, 2012.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.