Não informado. (2004). World population. U.S. Department of Commerce, Bureau of the Census.
Chicago-Zitierstil (17. Ausg.)Não informado. World Population. Washington: U.S. Department of Commerce, Bureau of the Census, 2004.
MLA-Zitierstil (8. Ausg.)Não informado. World Population. U.S. Department of Commerce, Bureau of the Census, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.