World Health Organization. (1995). International travel and health: Vaccination requirements and health advice. World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. Geneva: World Health Organization, 1995.
MLA-referens (8:e uppl.)World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. World Health Organization, 1995.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.