United Nations Environment Programme, El-Kholy, O. A., & Tolba, M. K. (1992). The World environment 1972-1992: Two decades of challenge. Published by Chapman & Hall on behalf of the United Nations Environment Programme.
Chicago Style (17th ed.) CitationUnited Nations Environment Programme, O. A. El-Kholy, and Mostafa Kamal Tolba. The World Environment 1972-1992: Two Decades of Challenge. London: Published by Chapman & Hall on behalf of the United Nations Environment Programme, 1992.
MLA (9th ed.) CitationUnited Nations Environment Programme, et al. The World Environment 1972-1992: Two Decades of Challenge. Published by Chapman & Hall on behalf of the United Nations Environment Programme, 1992.
Warning: These citations may not always be 100% accurate.