APA (7th ed.) Citation

United Nations Environment Programme. (2001). Protecting the ozone layer. UNEP.

Chicago Style (17th ed.) Citation

United Nations Environment Programme. Protecting the Ozone Layer. Nairopi, Kenya: UNEP, 2001.

MLA (9th ed.) Citation

United Nations Environment Programme. Protecting the Ozone Layer. UNEP, 2001.

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