World Bank. (2001). African Development Indicators 2001. The international Bank for Reconstruction and Development.
Chicago-viite (17. p.)World Bank. African Development Indicators 2001. Washington: The international Bank for Reconstruction and Development, 2001.
MLA-viite (9. p.)World Bank. African Development Indicators 2001. The international Bank for Reconstruction and Development, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.