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