Não informado. (2004). World population. U.S. Department of Commerce, Bureau of the Census.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. World Population. Washington: U.S. Department of Commerce, Bureau of the Census, 2004.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. World Population. U.S. Department of Commerce, Bureau of the Census, 2004.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.