United Nations. (1993). The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. UN.
Chicago Style (17th ed.) CitationUnited Nations. The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. New York: UN, 1993.
MLA (8th ed.) CitationUnited Nations. The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. UN, 1993.
Warning: These citations may not always be 100% accurate.