APA
Population Reference Bureau, . (2008). World Population: Data Sheet 2008. Washington, DC: Population Reference Bureau.
Chicago
Population Reference Bureau, . 2008. World Population: Data Sheet 2008. Washington, DC: Population Reference Bureau.
Harvard
Population Reference Bureau, . (2008). World Population: Data Sheet 2008. Washington, DC: Population Reference Bureau.
MLA
Population Reference Bureau, . World Population: Data Sheet 2008. Washington, DC: Population Reference Bureau. 2008.
