Norris, J. M. (2008). Validity evaluation in language assessment. Peter Lang.
Lua i Stíl Chicago (17ú heag.)Norris, John Michael. Validity Evaluation in Language Assessment. Frankfurt am Main ; New York: Peter Lang, 2008.
Lua MLA (9ú heag.)Norris, John Michael. Validity Evaluation in Language Assessment. Peter Lang, 2008.
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