APA (7th ed.) Citation

United Nations Environment Programme (Nairobi). (1991). Urban air pollution. The Programme.

Chicago Style (17th ed.) Citation

United Nations Environment Programme (Nairobi). Urban Air Pollution. Nairobi: The Programme, 1991.

MLA (9th ed.) Citation

United Nations Environment Programme (Nairobi). Urban Air Pollution. The Programme, 1991.

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