Wrightstone, J. W. (1956). Evaluation in modern education. American Book Comp.
Lua i Stíl Chicago (17ú heag.)Wrightstone, J. Wayne. Evaluation in Modern Education. American Book Comp, 1956.
Lua MLA (8ú heag.)Wrightstone, J. Wayne. Evaluation in Modern Education. American Book Comp, 1956.
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