Dyfyniad APA
ebrary, Inc, Greaney, V., & Kellaghan, T. (2008). National assessments of educational achievement. World Bank.
Dyfyniad Arddull Chicago
ebrary, Inc, Vincent Greaney, and Thomas Kellaghan. National Assessments of Educational Achievement. Washington, DC: World Bank, 2008.
Dyfyniad MLA
ebrary, Inc, et al. National Assessments of Educational Achievement. World Bank, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.