United Nations Environment Programme & UNEP. Global Environment Outlook 3: Past, present and future perspectives. GEO-3: past, present and future perspectives.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited Nations Environment Programme और UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives. UNEP. EARTHSCAN.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited Nations Environment Programme और UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.