APA (7th ed.) Citation

United Nations. Environment Programme & World Health Organization. (1977). Oxides of nitrogen. World Health Organization.

Chicago Style (17th ed.) Citation

United Nations. Environment Programme and World Health Organization. Oxides of Nitrogen. Geneva: World Health Organization, 1977.

MLA (9th ed.) Citation

United Nations. Environment Programme and World Health Organization. Oxides of Nitrogen. World Health Organization, 1977.

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