(2009). World development indicators 2009. The World Bank.
Lua i Stíl Chicago (17ú heag.)World Development Indicators 2009. The World Bank, 2009.
Lua MLA (8ú heag.)World Development Indicators 2009. The World Bank, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.