Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Population Reports. Washington: George Washington University, Department of Medical and Public Affairs.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Population Reports. George Washington University, Department of Medical and Public Affairs.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.