Não informado. (2018). Population Reports. George Washington University, Department of Medical and Public Affairs.
Chicago-viite (17. p.)Não informado. Population Reports. Washington: George Washington University, Department of Medical and Public Affairs, 2018.
MLA-viite (8. p.)Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs, 2018.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.