Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs.
Chicago-referens (17:e uppl.)Não informado. Population Reports. Washington: George Washington University, Department of Medical and Public Affairs.
MLA-referens (8:e uppl.)Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.
