WILHELMS, F. T. (1967). Evaluation as feedback and guide - Fred T.Wilhelms. ASCD,NEA.
Lua i Stíl Chicago (17ú heag.)WILHELMS, Fred T. Evaluation as Feedback and Guide - Fred T.Wilhelms. ASCD,NEA, 1967.
Lua MLA (8ú heag.)WILHELMS, Fred T. Evaluation as Feedback and Guide - Fred T.Wilhelms. ASCD,NEA, 1967.
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