APA (7th ed.) Citation

Smith, D. L. (1977). Human settlements and ecosystems (Rev. draft.). United Nations Environment Programme.

Chicago Style (17th ed.) Citation

Smith, Diana Lee. Human Settlements and Ecosystems. Rev. draft. [S.l.]: United Nations Environment Programme, 1977.

MLA (9th ed.) Citation

Smith, Diana Lee. Human Settlements and Ecosystems. Rev. draft. United Nations Environment Programme, 1977.

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