(2003). Financing education: Investments and returns : analysis of the world education indicators (Two thousand two edition.). UNESCO Institute for Statistics : Organisation for Economic Co-operation and Development : World Education Indicators Programme.
Lua i Stíl Chicago (17ú heag.)Financing Education: Investments and Returns : Analysis of the World Education Indicators. Two thousand two edition. Paris, France: UNESCO Institute for Statistics : Organisation for Economic Co-operation and Development : World Education Indicators Programme, 2003.
Lua MLA (9ú heag.)Financing Education: Investments and Returns : Analysis of the World Education Indicators. Two thousand two edition. UNESCO Institute for Statistics : Organisation for Economic Co-operation and Development : World Education Indicators Programme, 2003.