United Nations Environment Programme & UNEP. Global Environment Outlook 3: Past, present and future perspectives. GEO-3: past, present and future perspectives.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited Nations Environment Programme এবং UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives. UNEP. EARTHSCAN.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUnited Nations Environment Programme এবং UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives.
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