APA (7th ed.) Citation

United Nations Environment Programme & United Nations Environment Programme. Governing Council. The State of the environment (Began in 1973.). United Nations Environment Programme.

Chicago Style (17th ed.) Citation

United Nations Environment Programme and United Nations Environment Programme. Governing Council. The State of the Environment. Began in 1973. Nairobi, Kenya: United Nations Environment Programme.

MLA (9th ed.) Citation

United Nations Environment Programme and United Nations Environment Programme. Governing Council. The State of the Environment. Began in 1973. United Nations Environment Programme.