Roche, C. (1999). Impact assessment for development agencies: Learning to value change. Oxfam.
Lua i Stíl Chicago (17ú heag.)Roche, Chris. Impact Assessment for Development Agencies: Learning to Value Change. Oxford: Oxfam, 1999.
Lua MLA (8ú heag.)Roche, Chris. Impact Assessment for Development Agencies: Learning to Value Change. Oxfam, 1999.
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