United nations. (1991). Assessment of Long-range transboundary air pollution. UN.
Chicago Style (17th ed.) CitationUnited nations. Assessment of Long-range Transboundary Air Pollution. Geneva: UN, 1991.
MLA (8th ed.) CitationUnited nations. Assessment of Long-range Transboundary Air Pollution. UN, 1991.
Warning: These citations may not always be 100% accurate.