Não informado. (2018). 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, 2018.
MLA-referens (8:e uppl.)Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs, 2018.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.