APA (7th ed.) Citation

United Nations Environment Programme. (1982). Voices in defence of the earth. [publisher not identified].

Chicago Style (17th ed.) Citation

United Nations Environment Programme. Voices in Defence of the Earth. Nairobi, Kenya : UNEP: [publisher not identified], 1982.

MLA (9th ed.) Citation

United Nations Environment Programme. Voices in Defence of the Earth. [publisher not identified], 1982.

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