(1980). Evaluating social action projects: Principles, methodological aspects, and selected examples. Unesco.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEvaluating Social Action Projects: Principles, Methodological Aspects, and Selected Examples. Paris: Unesco, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEvaluating Social Action Projects: Principles, Methodological Aspects, and Selected Examples. Unesco, 1980.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.