Greaney, V., & Kellaghan, T. (2008). Assessing national achievement levels in education. World Bank.
Lua i Stíl Chicago (17ú heag.)Greaney, Vincent, agus Thomas Kellaghan. Assessing National Achievement Levels in Education. Washington, DC: World Bank, 2008.
Lua MLA (9ú heag.)Greaney, Vincent, agus Thomas Kellaghan. Assessing National Achievement Levels in Education. World Bank, 2008.