Cita APA (7th ed.)

World Health Organization. (1983). Air quality in selected urban areas, 1979-1980. WHO.

Cita Chicago (17th ed.)

World Health Organization. Air Quality in Selected Urban Areas, 1979-1980. Geneva: WHO, 1983.

Cita MLA (9th ed.)

World Health Organization. Air Quality in Selected Urban Areas, 1979-1980. WHO, 1983.