Watson, R. T. (1995). Global biodiversity assessment: Summary for policy-makers. United Nations Environment Programme.
Lua i Stíl Chicago (17ú heag.)Watson, R. T. Global Biodiversity Assessment: Summary for Policy-makers. Cambridge: United Nations Environment Programme, 1995.
Lua MLA (9ú heag.)Watson, R. T. Global Biodiversity Assessment: Summary for Policy-makers. United Nations Environment Programme, 1995.
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