World Health Organization. (1999). STI HIV: Status and trends of STI, HIV and AIDS at the end of the Millennium. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. STI HIV: Status and Trends of STI, HIV and AIDS at the End of the Millennium. Geneva, Switzerland: World Health Organization, 1999.
Citatione MLA (8a ed.)World Health Organization. STI HIV: Status and Trends of STI, HIV and AIDS at the End of the Millennium. World Health Organization, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.