Alkin, M. C., & Solmon, L. C. (1983). The costs of evaluation. Sage Publ.
Lua i Stíl Chicago (17ú heag.)Alkin, Marvin C., agus Lewis C. Solmon. The Costs of Evaluation. Sage Publ, 1983.
Lua MLA (8ú heag.)Alkin, Marvin C., agus Lewis C. Solmon. The Costs of Evaluation. Sage Publ, 1983.
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