APA (7th ed.) Citation

United Nations. (1993). The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. UN.

Chicago Style (17th ed.) Citation

United Nations. The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. New York: UN, 1993.

MLA (8th ed.) Citation

United Nations. The State of Transboundary Air Pollution 1992 Update: Air Pollution Studies 9. UN, 1993.

Warning: These citations may not always be 100% accurate.