Weltgesundheitsorganisation. (1982). Vaccination certificate requirements for international travel: Situation as on 1 January 1982 and health advice to travellers. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Weltgesundheitsorganisation. Vaccination Certificate Requirements for International Travel: Situation as on 1 January 1982 and Health Advice to Travellers. Geneva: World Health Organization, 1982.
MLA-Zitierstil (9. Ausg.)Weltgesundheitsorganisation. Vaccination Certificate Requirements for International Travel: Situation as on 1 January 1982 and Health Advice to Travellers. World Health Organization, 1982.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.