Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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