Rossi, P. H., Lipsey, M. W., & Freeman, H. E. (2004). Evaluation: A systematic approach (7th ed.). Sage.
Lua i Stíl Chicago (17ú heag.)Rossi, Peter H., Mark W. Lipsey, agus Howard E. Freeman. Evaluation: A Systematic Approach. 7th ed. Thousand Oaks, CA: Sage, 2004.
Lua MLA (8ú heag.)Rossi, Peter H., et al. Evaluation: A Systematic Approach. 7th ed. Sage, 2004.
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